A History of Short Words

From the New York Times Crossword Puzzle

HOC

Mon, 15 Jan '24: Ad ___ committee
Wed, 10 Jan '24: Ad ___
Sun, 2 Oct '22: Post ___ (occurring after the event)
Fri, 30 Sep '22: Ad ___
Mon, 17 May '21: Ad ___ committee
Fri, 16 Apr '21: Post ___ analysis
Tue, 23 Feb '21: Ad ___