Ex
来自Big Physics
mid 19th century (in ex1 (sense 2)): from Latin, ‘out of’.
wiktionary
ex (plural exes)
From the fact that crossing something out often results in the shape of the letter X.
Standalone use of prefix ex-
From Latin ex(“out of, from”); originated as a telegraphic abbreviation
Clipping of expensive.
etymonline
ex (n.)
1827, originally short for ex-Catholic; see ex-. Since 1929 as abbreviation for ex-wife, ex-husband, etc. Also used in some commercial compound words for "from, out of."
