limitation or restriction.
repression of natural feelings and impulses: to practice constraint.
unnatural restraint in manner, conversation, etc.; embarrassment.
something that constrains.
the act of constraining.
the condition of being constrained.
Linguistics. a restriction on the operation of a linguistic rule or the occurrence of a linguistic construction.

1350–1400; Middle English constreinte < Middle French, noun use of feminine past participle of constreindre; see constrain

nonconstraint, noun

1. force, obligation, pressure. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
constraint (kənˈstreɪnt)
1.  compulsion, force, or restraint
2.  repression or control of natural feelings or impulses
3.  a forced unnatural manner; inhibition
4.  something that serves to constrain; restrictive condition: social constraints kept him silent
5.  linguistics any very general restriction on a sentence formation rule

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

late 14c., "distress, oppression," from O.Fr. constreinte (Mod.Fr. contrainte), fem. noun from constreint, pp. of constreindre, from V.L. *constrinctus, from L. constrictus (see constrain). Meaning "coercion, compulsion" is from 1530s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

constraint definition

programming, mathematics
A Boolean relation, often an equality or ineqality relation, between the values of one or more mathematical variables (often two). E.g. x>3 is a constraint on x. constraint satisfaction attempts to assign values to variables so that all constraints are true.
Usenet newsgroup: news:comp.constraints. FAQ (
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The main advantage of online learning, in my view, is that it removes the
  space-time constraint.
Another constraint faced by large arthropods is breathing.
The liberty of action you prescribe is rather a necessity for me than a
Future reactor designs may make this easier, but for now it's a constraint.
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