Mentor is defined as someone who guides another to greater success.(noun)
A teacher is an example of a mentor.
See mentor in Webster's New World College Dictionary
Origin: L < Gr Mentōr, lit., adviser, akin to Sans mantár-: see mandarin
transitive verb, intransitive verb
See mentor in American Heritage Dictionary 4
Origin: French Mentor, Mentor
Origin: , from Latin Mentōr
Origin: , from Greek; see men-1 in Indo-European roots.
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