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The Collaborative International Dictionary of English v.0.48 (gcide)

ex \ex\ ([e^]ks), n.
The letter x.
[PJC]


ex \ex\ ([e^]ks), prep. (Finance)
Without (some right); not including the right to have; as, a
stock selling ex dividend (a stock for which the right to a
dividend has expired the previous day); ex interest; ex
rights.
[PJC]


Ex- \Ex-\ ([e^]ks).
A prefix from the latin preposition, ex, akin to Gr. 'ex or
'ek signifying out of, out, proceeding from. Hence, in
composition, it signifies out of, as, in exhale, exclude;
off, from, or out, as in exscind; beyond, as, in excess,
exceed, excel; and sometimes has a privative sense of
without, as in exalbuminous, exsanguinous. In some words, it
intensifies the meaning; in others, it has little affect on
the signification. It becomes ef- before f, as in effuse. The
form e- occurs instead of ex- before b, d, g, l, m, n, r, and
v, as in ebullient, emanate, enormous, etc. In words from the
French it often appears as es-, sometimes as s- or ['e]-; as,
escape, scape, ['e]lite. Ex-, prefixed to names implying
office, station, condition, denotes that the person formerly
held the office, or is out of the office or condition now;
as, ex-president, ex-governor, ex-mayor, ex-wife, ex-convict.
The Greek form 'ex becomes ex in English, as in exarch; 'ek
becomes ec, as in eccentric.
[1913 Webster]


ex \ex\ ([e^]ks), n. [contraction]
An ex-wife or ex-husband; a former spouse; -- used usually
with a possessive; as, she invited her ex to her second
wedding; her ex; his ex; John's ex. [informal]
[PJC]