A History of Short Words

From the New York Times Crossword Puzzle

SINE

Fri, 3 Sep '21
0, for 0°
Fri, 7 May '21
Reciprocal of cosecant
Sun, 4 Apr '21
Ratio of an angle's opposite side to the hypotenuse
Thu, 11 Mar '21
Function yielding 0 when applied to pi