All 4 Uses

mentor
in
The Soloist
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Having spent years under Homer Mensch's wing, he recognized the sound as that of his mentor, and he decided to steal just a minute or two to peek in and watch the master at work.†
Chpt 1.8 *
Hands clasped in front of him, suavely collegial, Nathaniel tells Snyder that his mentor, Mr. Harry Barnoff, put in forty-six years with the Cleveland Orchestra.†
Chpt 1.12
As Cleveland burned, Nathaniel, a black teenager with a white mentor, was hard at work on Beethoven and Brahms.†
Chpt 2.16
It's the room where Nathaniel auditioned in spring and where he played again for his new teacher and mentor, Homer Mensch, who would decide which of three orchestras Nathaniel would be assigned to.†
Chpt 3.26

Definitions:

(1) (mentor)
someone who guides and advises another who is less experienced; or the act of providing such guidance
(2) (meaning too rare to warrant focus)
Much less commonly, in the ancient Greek story of The Odyssey, Mentor was a friend of Odysseus.