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The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from the Latin ante meridiem, meaning "before midday") and p.m. (post meridiem, "after midday"). [1]

54 relations: Airplane, Amenhotep I, Ancient Egypt, Ancient Rome, Astrolabe, Astronomical clock, Bus, Chinese characters, CJK characters, Clock position, Common Era, Date and time representation by country, De facto, Decimal time, Digital clock, Earth's rotation, English language, Finnish language, Full stop, German American, Greek language, Hungarian language, Indonesian language, ISO 8601, Italy, Latin, Letter case, Linux, Mac OS, Mesopotamia, Microsoft Windows, Midnight, National Institute of Standards and Technology, Noon, Northern Europe, Numbering scheme, Roman numerals, Sinhalese language, Six-hour clock, Small caps, Social dance, Spanish language, Style guide, Sun, Sundial, The American Heritage Dictionary of the English Language, The Canadian Press, Train, Unicode, Unix-like, ..., Water clock, Wells Cathedral clock, 24-hour analog dial, 24-hour clock. Expand index (4 more) »


An airplane or aeroplane (informally plane) is a powered, fixed-wing aircraft that is propelled forward by thrust from a jet engine or propeller.

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Amenhotep I

Amenhotep I from Ancient Egyptian "jmn-ḥtp" or "yamānuḥātap" meaning "Amun is satisfied" or Amenophis I from Ancient Greek Ἀμένωφις, was the second Pharaoh of the 18th dynasty of Egypt.

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Ancient Egypt

Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt.

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Ancient Rome

Ancient Rome was an Italic civilization that began on the Italian Peninsula as early as the 8th century BC.

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An astrolabe (ἀστρολάβος astrolabos, "star-taker"), Oxford English Dictionary 2nd ed.

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Astronomical clock

An astronomical clock is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the sun, moon, zodiacal constellations, and sometimes major planets.

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A bus (plural "buses",, archaically also omnibus, multibus, or autobus) is a road vehicle designed to carry many passengers.

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Chinese characters

Chinese characters are logograms used in the writing of Chinese and some other Asian languages.

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CJK characters

In internationalization, CJK is a collective term for the Chinese, Japanese, and Korean languages, all of which use Chinese characters and derivatives (collectively, CJK characters) in their writing systems.

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Clock position

A clock position is the relative direction of an object described using the analogy of a 12-hour clock.

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Common Era

Common Era (also Current Era or Christian Era), abbreviated as CE, is an alternative naming of the calendar era Anno Domini ("in the year of the/our Lord", abbreviated AD).

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Date and time representation by country

Different conventions exist around the world for date and time representation, both written and spoken.

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De facto

De facto is a Latin expression that means "in fact, in reality, in actual existence, force, or possession, as a matter of fact" (literally "from fact").

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Decimal time

Decimal time is the representation of the time of day using units which are decimally related.

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Digital clock

A digital clock is a type of clock that displays the time digitally (i.e. in numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands.

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Earth's rotation

Earth's rotation is the rotation of the planet Earth around its own axis.

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English language

English is a West Germanic language that was first spoken in early medieval England and is now a global lingua franca.

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Finnish language

Finnish (or suomen kieli) is the language spoken by the majority of the population in Finland and by ethnic Finns outside Finland.

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Full stop

In punctuation, the full stop (in British English) or period (in American English) is the punctuation mark placed at the end of a sentence.

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German American

German Americans (Deutschamerikaner) are Americans who are of German descent.

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Greek language

Greek or Hellenic (Modern Greek: ελληνικά, elliniká, "Greek", ελληνική γλώσσα, ellinikí glóssa, "Greek language") is an independent branch of the Indo-European family of languages, native to the southern Balkans, the Aegean Islands, western Asia Minor, parts of northern and Eastern Anatolia and the South Caucasus, southern Italy, Albania and Cyprus.

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Hungarian language

Hungarian is the official language of Hungary and one of the 24 official languages of the European Union.

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Indonesian language

Indonesian (Bahasa Indonesia) is the official language of Indonesia.

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ISO 8601

ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date and time-related data.

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Italy (Italia), officially the Italian Republic (Repubblica Italiana), is a unitary parliamentary republic in Europe.

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Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

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Letter case

In orthography and typography, letter case (or just case) is the distinction between the letters that are in larger upper case (also capital letters, capitals, caps, large letters, or more formally majuscule (see ''Terminology'') and smaller lower case (also small letters, or more formally minuscule, see ''Terminology'') in the written representation of certain languages. Here is a comparison of the upper and lower case versions of each letter included in the English alphabet (the exact representation will vary according to the font used): Typographically, the basic difference between the majuscules and minuscules is not that the majuscules are big and minuscules small, but that the majuscules generally have the same height, whilst the height of the minuscules varies, as some of them have parts higher or lower than the average, i.e. ascenders and descenders. In Times New Roman, for instance, b, d, f, h, k, l, t are the letters with ascenders, and g, j, p, q, y are the ones with descenders. Further to this, with old-style numerals still used by some traditional or classical fonts—although most do have a set of alternative Lining Figures— 6 and 8 make up the ascender set, and 3, 4, 5, 7 and 9 the descender set. Letter case is often prescribed by the grammar of a language or by the conventions of a particular discipline. In orthography, the uppercase is primarily reserved for special purposes, such as the first letter of a sentence or of a proper noun, which makes the lowercase the more common variant in text. In mathematics, letter case may indicate the relationship between objects with uppercase letters often representing "superior" objects (e.g. X could be a set containing the generic member x). Engineering design drawings are typically labelled entirely in upper-case letters, which are easier to distinguish than lowercase, especially when space restrictions require that the lettering be small.

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Linux (pronounced or, less frequently) is a Unix-like and mostly POSIX-compliant computer operating system (OS) assembled under the model of free and open-source software development and distribution.

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Mac OS

Mac OS is a series of graphical user interface–based operating systems developed by Apple Inc. for their Macintosh line of computer systems.

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Mesopotamia (from the Μεσοποταμία " between rivers"; بلاد الرافدين bilād ar-rāfidayn; میان‌رودان miyān rodān; ܒܝܬ ܢܗܪܝܢ Beth Nahrain "land of rivers") is a name for the area of the Tigris–Euphrates river system, corresponding to modern-day Iraq, Kuwait, the northeastern section of Syria, as well as parts of southeastern Turkey and of southwestern Iran.

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Microsoft Windows

Microsoft Windows (or simply Windows) is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft.

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Midnight is the transition time period from one day to the next: the moment when the date changes.

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National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST), known between 1901 and 1988 as the National Bureau of Standards (NBS), is a measurement standards laboratory, also known as a National Metrological Institute (NMI), which is a non-regulatory agency of the United States Department of Commerce.

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Noon (also midday or noon time) is usually defined as 12 o'clock in the daytime.

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Northern Europe

Northern Europe is the northern part or region of Europe.

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Numbering scheme

There are many different numbering schemes for assigning nominal numbers to entities.

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Roman numerals

Roman numerals, the numeric system used in ancient Rome, employs combinations of letters from the Latin alphabet to signify values.

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Sinhalese language

Sinhalese, known natively as Sinhala (සිංහල), is the native language of the Sinhalese people, who make up the largest ethnic group in Sri Lanka, numbering about 16 million.

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Six-hour clock

The six-hour clock is a traditional timekeeping system used in the Thai and formerly the Lao language and the Khmer language, alongside the official 24-hour clock.

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Small caps

In typography, small capitals (usually abbreviated small caps) are uppercase (capital) characters set at the same height and weight as surrounding lowercase (small) letters or text figures.

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Social dance

Social dance is a major category or classification of danceforms or dance styles, where sociability and socializing are the primary focuses of the dancing.

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Spanish language

Spanish (español), also called Castilian, is a Romance language that originated in the Castile region of Spain and today has hundreds of millions of native-speakers.

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Style guide

A style guide is a set of standards for the writing and design of documents, either for general use or for a specific publication, organization, or field.

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The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.

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A sundial is a device that tells the time of day by the apparent position of the Sun in the sky.

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The American Heritage Dictionary of the English Language

The American Heritage Dictionary of the English Language (AHD) is an American dictionary of English published by Boston publisher Houghton Mifflin, the first edition of which appeared in 1969.

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The Canadian Press

The Canadian Press (often abbreviated as CP), known in French as La Presse Canadienne (PC), is a national news agency headquartered in Toronto.

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A train is a form of rail transport consisting of a series of vehicles that usually runs along a rail track to transport cargo or passengers.

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Unicode is a computing industry standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems.

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A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification.

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Water clock

A water clock or clepsydra (Greek κλεψύδρα from κλέπτειν kleptein, 'to steal'; ὕδωρ hydor, 'water') is any timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel where the amount is then measured.

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Wells Cathedral clock

The Wells Cathedral clock is an astronomical clock in the north transept of Wells Cathedral, England.

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24-hour analog dial

Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).

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24-hour clock

The 24-hour clock is the convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23.

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[1] https://en.wikipedia.org/wiki/12-hour_clock

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