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• pm
  pm

  noun

  a private message sent to another user of a social media service or private messaging service.
• Pm
  Pm

  promethium.
• pm.
  pm.

  abbreviation

  premium.
• p.m.
  p.m.

  abbreviation

  after noon.
• P.M.
  P.M.

  abbreviation

  past master.
• PM
  PM

  abbreviation

  Prime Minister

pm

¹ American  

Or PM

noun

pms, plural pm's plural

1. a private message sent to another user of a social media service or private messaging service.

   How do I send a pm to the moderator of the message board?

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verb (used with object)

pm'd, pmed, pm'ing, pming

1. to send a private message to (another user of such a service).

Pm ² American  

Symbol, Chemistry.

1. promethium.

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pm. ³ American  

abbreviation

1. premium.

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p.m. ⁴ American  

abbreviation

1. after noon.

2. the period between noon and midnight.

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P.M. ⁵ American  

Or PM

abbreviation

1. past master.

2. paymaster.

3. p.m.

4. Police Magistrate.

5. postmaster.

6. postmortem.

7. prime minister.

8. provost marshal.

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PM ¹ British  

abbreviation

1. Prime Minister

2. Past Master (of a fraternity)

3. Paymaster

4. Postmaster

5. military Provost Marshal

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p.m. ² British  

abbreviation

1. (indicating the time period from midday to midnight) post meridiem See a.m.

2. post-mortem (examination)

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Pm ³ British  

symbol

1. promethium

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pm ⁴ British  

abbreviation

1. premium

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pm ⁵ British  

abbreviation

1. St Pierre and Miquelon

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Usage

See a.m.

Other Word Forms

Noun Inflected Forms

• pm's
  plural
• pms
  plural

Etymology

Origin of pm¹

First recorded in 2000–05

Origin of p.m.⁴

From Latin post merīdiem

Example Sentences

The South Coast Air Quality Management District issued multiple warnings about unhealthy levels of PM 2.5, or fine particulate matter.

From Los Angeles Times • Jun. 30, 2026

"Anyone for PM?" asks the Daily Star, adding "nobody chose him either."

From BBC • Jun. 30, 2026

Another warning for Burnham comes from former PM Sir John Major, who sat down with the Independent, saying that the former Greater Manchester mayor may not be prepared for the trials of the highest office.

From BBC • Jun. 26, 2026

In travel news this week, all anyone in Europe could talk about, besides Cannes Lions and the resignation of British PM Keir Starmer, was the heat wave.

From The Wall Street Journal • Jun. 26, 2026

Electricity was rationed from six PM to six AM, though sometimes it did not come on at all.

From "I Will Always Write Back" by Caitlin Alifirenka and Martin Ganda