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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

It began continuous PM 2.5. monitoring at two nearby elementary schools on the third day.

From Los Angeles Times • Jun. 30, 2026

The paper cites a source who says should Burnham become PM, "devolution will be at the heart" of his policy to rewire the economy.

From BBC • Jun. 28, 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

Burnham on course to be PM, but what would his No 10 operation look like?

From BBC • Jun. 24, 2026

We all three shared a room for our first two years at PM.

From "Winger" by Andrew Smith