Dictionary![]() ![]() Pm—Symbol, Chem. promethium. pm.premium. P.M.1. Past Master. 2. Paymaster. 3. See p.m. 4. Police Magistrate. 5. Postmaster. 6. post-mortem. 7. Prime Minister. 8. Provost Marshal. p.m.1. after noon. 2. the period between noon and midnight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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