verb (used without object), behaved, behaving.
to act in a particular way; conduct or comport oneself or itself: The ship behaves well.
to act properly: Did the child behave?
to act or react under given circumstances: This plastic behaves strangely under extreme heat or cold.
verb (used with object), behaved, behaving.
to conduct or comport (oneself) in a proper manner: Sit quietly and behave yourself.

1400–50; late Middle English behaven (reflexive). See be-, have

unbehaving, adjective
well-behaved, adjective

1. perform, acquit oneself, deport oneself. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
behave (bɪˈheɪv)
1.  (intr) to act or function in a specified or usual way
2.  to conduct (oneself) in a specified way: he behaved badly towards her
3.  to conduct (oneself) properly or as desired: the child behaved himself all day
[C15: see be-, have]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., from be- intensive prefix + have; the sense is "to have or bear (oneself) in a particular way, comport" (cf. Ger. sich behaben, Fr. se porter). Cognate O.E. compound behabban meant "to contain," though the modern sense of behave could have
evolved from behabban via a notion of "self-restraint."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Articles in this series are examining how a deluge of data can affect the way
  people think and behave.
They have an inability to control their emotions or to behave rationally.
Capture those similarities in a model and it should be possible to predict how
  a crowd will behave.
Even a poster with eyes on it changes how people behave.
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