From The Collaborative International Dictionary of English v.0.48 [gcide]:
Prophet \Proph"et\, n. [F. proph[`e]te, L. propheta, fr. Gr. ?,
literally, one who speaks for another, especially, one who
speaks for a god an interprets his will to man, fr. ? to say
beforehand; ? for, before + ? to say or speak. See Fame. ]
[1913 Webster]
1. One who prophesies, or foretells events; a predicter; a
foreteller.
[1913 Webster]
2. One inspired or instructed by God to speak in his name, or
announce future events, as, Moses, Elijah, etc.
[1913 Webster]
3. An interpreter; a spokesman. [R.] --Ex. vii. 1.
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4. (Zool.) A mantis.
[1913 Webster]
School of the prophets (Anc. Jewish Hist.), a school or
college in which young men were educated and trained for
public teachers or members of the prophetic order. These
students were called sons of the prophets.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
prophet
n 1: an authoritative person who divines the future [syn:
prophet, prophesier, oracle, seer, vaticinator]
2: someone who speaks by divine inspiration; someone who is an
interpreter of the will of God