teach·er

[tee-cher]
noun
a person who teaches or instructs, especially as a profession; instructor.

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

teach·er·less, adjective
teach·er·ship, noun
non·teach·er, noun
self-teach·er, noun
un·der·teach·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
teacher (ˈtiːtʃə) [Click for IPA pronunciation guide]
 
n
1.  a person whose occupation is teaching others, esp children
2.  a personified concept that teaches: nature is a good teacher
 
'teacherless
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Teacher is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

teacher
"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
He can get a home teacher or home school him yourself as you are able if you
  need too.
Yet it appears that no one bothered to contact a local high school physics
  teacher to look over this.
It has opened a new teacher-training campus with courses to degree level.
Any really good teacher will tell you that it's better to have one good teacher
  than to have two mediocre teachers.
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