Etymology
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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."

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Definitions of ex
1
ex (n.)
a man who was formerly a certain woman's husband;
Synonyms: ex-husband
ex (n.)
a woman who was formerly a particular man's wife;
Synonyms: ex-wife
2
ex (adj.)
out of fashion;
Synonyms: antique / demode / old-fashioned / old-hat / outmoded / passe / passee
From wordnet.princeton.edu