A History of Short Words

From the New York Times Crossword Puzzle

ENGR

Sun, 27 Feb '22
Part of STEM: Abbr.
Mon, 14 Feb '22
Profession for many an M.I.T. grad: Abbr.
Tue, 26 Oct '21
Head of a train: Abbr.
Tue, 25 May '21
Many a graduate of 37-Across: Abbr.