Source : Webster's Revised Unabridged Dictionary (1913)

Teach \Teach\, v. t. [imp. & p. p. {Taught}; p. pr. & vb. n.
   {Teaching}.] [OE. techen, imp. taughte, tahte, AS. t?cean,
   imp. t?hte, to show, teach, akin to t[=a]cn token. See
   {Token}.]
   1. To impart the knowledge of; to give intelligence
      concerning; to impart, as knowledge before unknown, or
      rules for practice; to inculcate as true or important; to
      exhibit impressively; as, to teach arithmetic, dancing,
      music, or the like; to teach morals.

            If some men teach wicked things, it must be that
            others should practice them.          --South.

   2. To direct, as an instructor; to manage, as a preceptor; to
      guide the studies of; to instruct; to inform; to conduct
      through a course of studies; as, to teach a child or a
      class. ``He taught his disciples.'' --Mark ix. 31.

            The village master taught his little school.
                                                  --Goldsmith.

   3. To accustom; to guide; to show; to admonish.

            I shall myself to herbs teach you.    --Chaucer.

            They have taught their tongue to speak lies. --Jer.
                                                  ix. 5.

   Note: This verb is often used with two objects, one of the
         person, the other of the thing; as, he taught me Latin
         grammar. In the passive construction, either of these
         objects may be retained in the objective case, while
         the other becomes the subject; as, I was taught Latin
         grammar by him; Latin grammar was taught me by him.

   Syn: To instruct; inform; inculcate; tell; guide; counsel;
        admonish. See the Note under {Learn}.

Teach \Teach\, v. i.
   To give instruction; to follow the business, or to perform
   the duties, of a preceptor.

         And gladly would he learn, and gladly teach. --Chaucer.

         The priests thereof teach for hire.      --Micah iii.
                                                  11.

Source : WordNet®

Teach
     n : an English pirate who operated in the Caribbean and off the
         Atlantic coast of North America (died in 1718) [syn: {Edward
         Teach}, {Thatch}, {Edward Thatch}, {Blackbeard}]
     v 1: impart skills or knowledge to; "I taught them French"; "He
          instructed me in building a boat" [syn: {learn}, {instruct}]
     2: accustom gradually to some action or attitude; "The child is
        taught to obey her parents"