A History of Short Words

From the New York Times Crossword Puzzle

ASSN

Mon, 3 Mar '25
Professional org.
Sun, 25 Dec '22
The "A" of P.G.A.: Abbr.
Mon, 19 Dec '22
Org.
Thu, 3 Nov '22
Org.
Sun, 19 Sep '21
Part of 79-Down: Abbr.
Fri, 1 Jan '21
Part of N.A.A.C.P.: Abbr.