Source : Webster's Revised Unabridged Dictionary (1913)

Affect \Af*fect"\ ([a^]f*f[e^]kt"), v. t. [imp. & p. p.
   {Affected}; p. pr. & vb. n. {Affecting}.] [L. affectus, p. p.
   of afficere to affect by active agency; ad + facere to make:
   cf. F. affectere, L. affectare, freq. of afficere. See
   {Fact}.]
   1. To act upon; to produce an effect or change upon.

            As might affect the earth with cold heat. --Milton.

            The climate affected their health and spirits.
                                                  --Macaulay.

   2. To influence or move, as the feelings or passions; to
      touch.

            A consideration of the rationale of our passions
            seems to me very necessary for all who would affect
            them upon solid and pure principles.  --Burke.

   3. To love; to regard with affection. [Obs.]

            As for Queen Katharine, he rather respected than
            affected, rather honored than loved, her. --Fuller.

   4. To show a fondness for; to like to use or practice; to
      choose; hence, to frequent habitually.

            For he does neither affect company, nor is he fit
            for it, indeed.                       --Shak.

            Do not affect the society of your inferiors in rank,
            nor court that of the great.          --Hazlitt.

   5. To dispose or incline.

            Men whom they thought best affected to religion and
            their country's liberty.              --Milton.

   6. To aim at; to aspire; to covet. [Obs.]

            This proud man affects imperial ?way. --Dryden.

   7. To tend to by affinity or disposition.

            The drops of every fluid affect a round figure.
                                                  --Newton.

   8. To make a show of; to put on a pretense of; to feign; to
      assume; as, to affect ignorance.

            Careless she is with artful care, Affecting to seem
            unaffected.                           --Congreve.

            Thou dost affect my manners.          --Shak.

   9. To assign; to appoint. [R.]

            One of the domestics was affected to his special
            service.                              --Thackeray.

   Syn: To influence; operate; act on; concern; move; melt;
        soften; subdue; overcome; pretend; assume.

Affect \Af*fect"\, n. [L. affectus.]
   Affection; inclination; passion; feeling; disposition. [Obs.]
   --Shak.

Affect \Af*fect"\, n. (Psychotherapy)
   The emotional complex associated with an idea or mental
   state. In hysteria, the affect is sometimes entirely
   dissociated, sometimes transferred to another than the
   original idea.

Source : WordNet®

affect
     n : the conscious subjective aspect of feeling or emotion
     v 1: have an effect upon; "Will the new rules affect me?" [syn: {impact},
           {bear upon}, {bear on}, {touch on}, {touch}]
     2: act physically on; have an effect upon
     3: connect closely and often incriminatingly; "This new ruling
        affects your business" [syn: {involve}, {regard}]
     4: make believe with the intent to deceive; "He feigned that he
        was ill"; "He shammed a headache" [syn: {feign}, {sham}, {pretend},
         {dissemble}]
     5: have an emotional or cognitive impact upon; "This child
        impressed me as unusually mature"; "This behavior struck
        me as odd" [syn: {impress}, {move}, {strike}]