World English Dictionary
behaviour or behavior (bɪˈheɪvjə) [Click for IPA pronunciation guide]
 
n
1.  manner of behaving or conducting oneself
2.  on one's best behaviour behaving with careful good manners
3.  psychol
 a.  the aggregate of all the responses made by an organism in any situation
 b.  a specific response of a certain organism to a specific stimulus or group of stimuli
4.  the action, reaction, or functioning of a system, under normal or specified circumstances
 
[C15: from behave; influenced in form by Middle English havior, from Old French havoir, from Latin habēre to have]
 
behavior or behavior
 
n
 
[C15: from behave; influenced in form by Middle English havior, from Old French havoir, from Latin habēre to have]
 
be'havioural or behavior
 
adj
 
be'havioral or behavior
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

behavioural
British spelling of behavioral (q.v.); for suffix, see -or.
Online Etymology Dictionary, © 2010 Douglas Harper
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00:10
Behavioural is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
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