Ex

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google

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mid 19th century (in ex1 (sense 2)): from Latin, ‘out of’.


Ety img ex.png

wiktionary

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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

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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."