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Pm
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Tweet The symbol for promethium. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
abbr. phase modulation |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
PM
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Tweet abbr. 1. particulate matter 2. past master 3. police magistrate 4. also PM or pm post meridiem 5. a. postmaster b. postmistress 6. postmortem 7. prime minister 8. provost marshal Usage Note: By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
