Source : Webster's Revised Unabridged Dictionary (1913)

Behavior \Be*hav"ior\, n.
   Manner of behaving, whether good or bad; mode of conducting
   one's self; conduct; deportment; carriage; -- used also of
   inanimate objects; as, the behavior of a ship in a storm; the
   behavior of the magnetic needle.

         A gentleman that is very singular in his behavior.
                                                  --Steele.

   {To be upon one's good behavior}, {To be put upon one's good
   behavior}, to be in a state of trial, in which something
      important depends on propriety of conduct.

   {During good behavior}, while (or so long as) one conducts
      one's self with integrity and fidelity or with propriety.

   Syn: Bearing; demeanor; manner.

   Usage: {Behavior}, {Conduct}. Behavior is the mode in which
          we have or bear ourselves in the presence of others or
          toward them; conduct is the mode of our carrying
          ourselves forward in the concerns of life. Behavior
          respects our manner of acting in particular cases;
          conduct refers to the general tenor of our actions. We
          may say of soldiers, that their conduct had been
          praiseworthy during the whole campaign, and their
          behavior admirable in every instance when they met the
          enemy.

Source : WordNet®

behavior
     n 1: manner of acting or conducting yourself [syn: {behaviour}, {conduct},
           {doings}]
     2: the action or reaction of something (as a machine or
        substance) under specified circumstances; "the behavior of
        small particles can be studied in experiments" [syn: {behaviour}]
     3: (behavioral attributes) the way a person behaves toward
        other people [syn: {demeanor}, {demeanour}, {behaviour}, {conduct},
         {deportment}]
     4: (psychology) the aggregate of the responses or reactions or
        movements made by an organism in any situation [syn: {behaviour}]