ex- 1
a prefix meaning "out of," "from," and hence "utterly," "thoroughly," and sometimes imparting a privative or negative force or indicating a former title, status, etc.; freely used as an English formative: exstipulate; exterritorial; ex-president (former president); ex-member; ex-wife.
Also, e-, ef- .
[ ex, e (prep.) out (of), from, beyond ]
ex- 2
var. of exo- .
ex- 3
a prefix identical in meaning with ex- 1 , occurring before vowels in words of Greek origin: exarch; exegesis.
Also, ec- .
[ ex, ek, out (of), from, beyond; see EC-, EX- 1 ]