Source : Webster's Revised Unabridged Dictionary (1913)

Vary \Va"ry\, n.
   Alteration; change. [Obs.] --Shak.

Vary \Va"ry\, v. i.
   1. To alter, or be altered, in any manner; to suffer a
      partial change; to become different; to be modified; as,
      colors vary in different lights.

            That each from other differs, first confess; Next,
            that he varies from himself no less.  --Pope.

   2. To differ, or be different; to be unlike or diverse; as,
      the laws of France vary from those of England.

   3. To alter or change in succession; to alternate; as, one
      mathematical quantity varies inversely as another.

            While fear and anger, with alternate grace, Pant in
            her breast, and vary in her face.     --Addison.

   4. To deviate; to depart; to swerve; -- followed by from; as,
      to vary from the law, or from reason. -- Locke.

   5. To disagree; to be at variance or in dissension; as, men
      vary in opinion.

            The rich jewel which we vary for.     --Webster
                                                  (1623).

Vary \Va"ry\, v. t. [imp. & p. p. {Varied}; p. pr. & vb. n.
   {Varying}.] [OE. varien, F. varier, L. variare, fr. varius
   various. See {Various}, and cf. {Variate}.]
   1. To change the aspect of; to alter in form, appearance,
      substance, position, or the like; to make different by a
      partial change; to modify; as, to vary the properties,
      proportions, or nature of a thing; to vary a posture or an
      attitude; to vary one's dress or opinions.

            Shall we vary our device at will, Even as new
            occasion appears?                     --Spenser.

   2. To change to something else; to transmute; to exchange; to
      alternate.

            Gods, that never change their state, Vary oft their
            love and hate.                        --Waller.

            We are to vary the customs according to the time and
            country where the scene of action lies. --Dryden.

   3. To make of different kinds; to make different from one
      another; to diversity; to variegate.

            God hath varied their inclinations.   --Sir T.
                                                  Browne.

            God hath here Varied his bounty so with new
            delights.                             --Milton.

   4. (Mus.) To embellish; to change fancifully; to present
      under new aspects, as of form, key, measure, etc. See
      {Variation}, 4.

Source : WordNet®

vary
     v 1: make or become different in some particular way, without
          permanently losing one's or its former characteristics
          or essence; "her mood changes in accordance with the
          weather"; "The supermarket's selection of vegetables
          varies according to the season" [syn: {change}, {alter}]
     2: be at variance with; be out of line with [syn: {deviate}, {diverge},
         {depart}] [ant: {conform}]
     3: be subject to change in accordance with a variable; "Prices
        vary"; "His moods vary depending on the weather"
     4: make something more diverse and varied; "Vary the menu"
        [syn: {variegate}, {motley}]
     [also: {varied}]