post meridiem

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Related to post meridiem: ante meridiem

post me·rid·i·em

adv. & adj. Abbr. PM also pm or pm
After noon. Used chiefly in the abbreviated form to specify the hour: 10:30 pm; a pm appointment. See Usage Note at PM.

[Latin post merīdiem : post, after + merīdiem, accusative of merīdiēs, midday.]

post meridiem

(ˈpəʊst məˈrɪdɪəm)
the full form of p.m.
[C17: Latin: after noon]


Chem. Symbol.


1. Past Master.
2. Paymaster.
3. Police Magistrate.
4. Postmaster.
5. post-mortem.
6. Prime Minister.
7. Provost Marshal.


or P.M.,

1. after noon.
2. the period between noon and midnight.
[< Latin post merīdiem]
usage: See a.m.

post meridiem

- The expansion of p.m., from Latin, meaning "after noon" (1647).
See also related terms for noon.
ThesaurusAntonymsRelated WordsSynonymsLegend: meridiem - after noon
postmeridian - after noon meridiem - between noon and midnight; "let's meet at 8 P.M."
Latin - any dialect of the language of ancient Rome
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References in periodicals archive ?
Relevant studies [Altakhaineh (2017); Khodorkowsky (2014)] mention the Roman origin of several abbreviations which are still in use today, such as AM and PM (ante meridiem and post meridiem, meaning "before noon" and "after noon"), AD, which indicates the time period after the birth of Christ and originates from the Latin anno domini, meaning "in the year of our Lord", SPQR (Senatus populusque Romanuis) "the Senate and People of Rome." Another well-known and old acronym, cited in the Christian Bible, is INRI (Iesus Nazarenus Rex Iudaeorum) "Jesus of Nazareth King of the Jews." [Altakhaineh (2017); Khodorkowsky (2014)]
Ante meridiem is before midday; post meridiem is after midday, and midday itself cannot logically be classified as either after or before itself.
At the same time, the rats in the treatment groups were intragastrically treated with silymarin (60 mg [kg.sup.-1] [d.sup.-1]) and PR (30, 60 and 120 mg [kg.sup.-1] [d.sup.-1]) post meridiem for a period of 24 weeks.