a person who teaches or instructs, especially as a profession; instructor.

1250–1300; Middle English techer. See teach, -er1

teacherless, adjective
teachership, noun
nonteacher, noun
self-teacher, noun
underteacher, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
teacher (ˈtiːtʃə)
1.  a person whose occupation is teaching others, esp children
2.  a personified concept that teaches: nature is a good teacher

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"one who teaches," c.1300; see teach. It was used earlier in a sense of "index finger" (late 13c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
New models for teacher preparation are thinking outside the box.
Note how the job description is similar to and different from that of a teacher.
Any teacher can tell you that smarts alone do not a good student make.
So long as a teacher imparts a sense of wonder and curiosity, the details will
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