?`s and ANNEswers

We have been unable to find any grammar rules for a sentence ending in a.m. or p.m. Does it need a second period or does the existing period do double duty? Is there a grammar rule for this?

This rule falls into the punctuation category; and it states, “When the last word in a sentence is abbreviated, one period will suffice.” A.M. is an abbreviated form for ante meridian, so it needs only one period if it falls at the end of a sentence. The same might apply to Esq., etc., or A.S.A.P.

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