post me·rid·i·em

(mə-rĭd′ē-əm)

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.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

post meridiem

(ˈpəʊst məˈrɪdɪəm)

the full form of p.m.

[C17: Latin: after noon]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Pm

Chem. Symbol.

promethium.

P.M.

1. Past Master.

2. Paymaster.

3. Police Magistrate.

4. Postmaster.

5. post-mortem.

6. Prime Minister.

7. Provost Marshal.

p.m.

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:

Adj.	1.	post meridiem - after noon p.m. postmeridian - after noon
Adv.	1.	post meridiem - between noon and midnight; "let's meet at 8 P.M." 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)]

Linguistic Features of Business Acronyms and Abbreviations in English

Ante meridiem is before midday; post meridiem is after midday, and midday itself cannot logically be classified as either after or before itself.

Worried about mid-day..

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.

Puerarin improves metabolic function leading to hepatoprotective effects in chronic alcohol-induced liver injury in rats