A History of Short Words

From the New York Times Crossword Puzzle

APPT

Tue, 1 Apr '25
Handwritten entry on a calendar: Abbr.
Mon, 10 Mar '25
Engagement to see a doctor, say: Abbr.
Sun, 3 Mar '24
Schedule slot filler: Abbr.
Thu, 26 Oct '23
Book it: Abbr.
Sat, 1 Jan '22
Engagement calendar info: Abbr.
Mon, 1 Feb '21
Entry in a doctor's calendar: Abbr.