Meaning of “mentor” in the English Dictionary

(Definition of “mentor” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mentor" in American English

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mentornoun [ C ]

us /ˈmen·tɔr, -tər/

an experienced and trusted person who gives another person advice and help, esp. related to work or school, over a period of time

mentoring
noun [ U ] us /ˈmen·tər·ɪŋ/

The students' chances can be improved with more studying, mentoring, and intensive review.

(Definition of “mentor” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"mentor" in Business English

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mentornoun [ C ]

uk /ˈmentɔːr/ us /ˈmentər/ HR, WORKPLACE

a person with experience in a job who supports and advises someone with less experience to help them develop in their work:

He acted as a business mentor to many young aspiring entrepreneurs.
See also

mentorverb [ T ]

uk /ˈmentɔːr/ us /ˈmentər/

to support and advise someone with less experience to help them develop in their work:

The programme was set up to train and mentor small-business entrepreneurs.

(Definition of “mentor” from the Cambridge Business English Dictionary © Cambridge University Press)