Teacher definitions

tē'chər
One who teaches, especially one hired to teach.
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A person who teaches, esp. as a profession; instructor.
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The definition of a teacher is someone who helps others learn new things.

An example of a teacher is the person who taught you math.

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A person who teaches, especially one employed in a school.
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The index finger; the forefinger.
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(Mormonism) The second highest office in the Aaronic priesthood, held by priesthood holders of at least the age of 14.
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Origin of teacher

From Middle English techere, equivalent to teach +"Ž -er. More at teach.