ante meridiem

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Related to ante meridiem: post meridiem

an·te me·rid·i·em

 (ăn′tē mə-rĭd′ē-əm)
adv. & adj. Abbr. AM or am or am
Before noon. Used chiefly in the abbreviated form to specify the hour: 10:30 am. See Usage Note at AM.

[Latin ante, before + merīdiem, accusative of merīdiēs, noon.]

ante meridiem

(ˈæntɪ məˈrɪdɪəm)
(Horology) the full form of a.m.
[Latin, from ante- + merīdiēs midday]


(æm; unstressed əm, m)

1st pers. sing. pres. indic. of be.
[before 900; Old English am, eam, eom]


1. Asian male.
2. amplitude modulation: a method of impressing a signal on a radio carrier wave by varying its amplitude.
3. a system of broadcasting using this method.
Compare FM.


Chem. Symbol.


1. America.
2. American.


Master of Arts.
[< Latin Artium Magister]


or A.M.,

1. before noon.
2. the period from midnight to noon, esp. the period of daylight prior to noon.
Compare p.m.
[1755–65; < Latin ante merīdiem]
usage: The abbreviation a.m. refers to the period from midnight until noon. One minute before noon is 11:59 a.m. One minute after noon is 12:01 p.m. Many people distinguish between noon and midnight by saying 12 noon and 12 midnight. Expressions such as 6 a.m. in the morning and 9 p.m. at night are redundant.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.ante meridiem - before noonante meridiem - before noon        
antemeridian - before noon
Adv.1.ante meridiem - before noonante meridiem - before noon; "let's meet at 11 A.M."
Latin - any dialect of the language of ancient Rome

ante meridiem

adv (abbr am) → vormittags
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References in periodicals archive ?
Ante meridiem is before midday; post meridiem is after midday, and midday itself cannot logically be classified as either after or before itself.
1] (fora period of 21 weeks) of distillate spirits (56% alcohol, v/v; Beijing Erguotou Wine Joint-Stock Limited Company, China) ante meridiem.