the act or profession of a person who teaches.
something that is taught.
Often, teachings. doctrines or precepts: the teachings of Lao-tzu.

1125–75; Middle English teching. See teach, -ing1

nonteaching, adjective
self-teaching, adjective
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verb (used with object), taught, teaching.
to impart knowledge of or skill in; give instruction in: She teaches mathematics. coach.
to impart knowledge or skill to; give instruction to: He teaches a large class. inform, enlighten, discipline, drill, school, indoctrinate; coach.
verb (used without object), taught, teaching.
to impart knowledge or skill; give instruction. inform, enlighten, discipline, drill, school, indoctrinate; coach.
Informal. teacher.

before 900; Middle English techen, Old English tǣcan; akin to token

overteach, verb, overtaught, overteaching.
preteach, verb, pretaught, preteaching.
reteach, verb, retaught, reteaching.
underteach, verb, undertaught, underteaching.

learn, teach.

Teach, instruct, tutor, train, educate share the meaning of imparting information, understanding, or skill. Teach is the broadest and most general of these terms and can refer to almost any practice that causes others to develop skill or knowledge: to teach children to write; to teach marksmanship to soldiers; to teach tricks to a dog. Instruct almost always implies a systematic, structured method of teaching: to instruct paramedics in techniques of cardiopulmonary resuscitation. Tutor refers to the giving of usually private instruction or coaching in a particular subject or skill: to tutor a child in (a foreign language, algebra, history, or the like). Train lays stress on the development of desired behaviors through practice, discipline, or the use of rewards or punishments: to train a child to be polite; to train recruits in military skills; to train a dog to heel. Educate, with a root sense of “to lead forth from,” refers to the imparting of a specific body of knowledge, especially one that equips a person to practice a profession: to educate a person for a high-school diploma; to educate someone for the law.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To teaching
World English Dictionary
teach (tiːtʃ)
vb (often foll by how) , teaches, teaching, taught
1.  to help to learn; tell or show (how): to teach someone to paint; to teach someone how to paint
2.  to give instruction or lessons in (a subject) to (a person or animal): to teach French; to teach children; she teaches
3.  (tr; may take a clause as object or an infinitive) to cause to learn or understand: experience taught him that he could not be a journalist
4.  informal Also: teach someone a lesson to cause (someone) to suffer the unpleasant consequences of some action or behaviour
[Old English tǣcan; related to tācentoken, Old Frisian tēken, Old Saxon tēkan, Old High German zeihhan, Old Norse teikn sign]

Teach (tiːtʃ)
Edward, known as Blackbeard. died 1718, English pirate, active in the West Indies and on the Atlantic coast of North America

teaching (ˈtiːtʃɪŋ)
1.  the art or profession of a teacher
2.  (sometimes plural) something taught; precept
3.  (modifier) denoting a person or institution that teaches: a teaching hospital
4.  (modifier) used in teaching: teaching aids

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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Word Origin & History

O.E. tæcan (past tense and pp. tæhte) "to show, point out," also "to give instruction," from P.Gmc. *taikijanan (cf. O.H.G. zihan, Ger. zeihen "to accuse," Goth. ga-teihan "to announce"), from PIE *deik- "to show, point out" (see diction). Related to O.E. tacen,
tacn "sign, mark" (see token). O.E. tæcan had more usually a sense of "show, declare, warn, persuade" (cf. Ger. zeigen "to show," from the same root); while the O.E. word for "to teach, instruct, guide" was more commonly læran, source of modern learn and lore.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The solution is better teachers, and more demanding professors of education at
  our teaching colleges.
And in pretty much every country where taxpayers pay for higher education, new
  students will find teaching is skimpier.
The paintings are used for hunting and fishing magic and also for teaching.
Eventually, he worked his way into a teaching job there.
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