ex-

from The Century Dictionary.

• noun A dialectal variant of ax.
• noun A dialectal form of ax.
• A dialectal variant of ask.
• noun The name of the letter X, x. It is rarely written, the symbol being used instead.
• A Latin preposition, meaning ‘out,’ ‘out of.’
• An abbreviation of Exodus.
• A prefix of Latin, and in some cases of Greek origin, meaning primarily ‘out,’ ‘out of.’

from the GNU version of the Collaborative International Dictionary of English.

• 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, . 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 é-. 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. The Greek form 'ex becomes ex in English, as in exarch; 'ek becomes ec, as in eccentric.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• prefix out of
• prefix outside
• prefix former, but still living (almost always used with a hyphen)
• prefix biology Lacking.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a man who was formerly a certain woman's husband
• adjective out of fashion
• noun a woman who was formerly a particular man's wife
• noun the 24th letter of the Roman alphabet