There are 2 definitions of Pm in English:

Pm1

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symbol

The chemical element promethium.

Definition of Pm in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of Pm in English:

PM2

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Pronunciation: /piːˈɛm
 
/
informal

abbreviation

1Post-mortem.
1.1Provost Marshal.

noun (plural PMs)

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1chiefly British The Prime Minister: a private meeting with the PM
2(In the context of Internet message boards) a private message, sent directly from one user to another: drop me a PM if you want more details

verb

[with object] (PMs, PMing, PMd) Back to top  
Send (another user of an Internet message board) a private message: I’ll PM you when I’m back online

Definition of Pm in: