Look up: constrain

1. constrain
   compel 
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2. Constrain
   To restrict the motion of an object to one or two planes, or to a certain range of values within a plane, in order to simplify the process of animation. Constraints are commonly imposed on joints within a skeleton during the process of rigging a character for animation, in order to prevent that char...
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3. Constrain
   Con·strain' transitive verb [ imperfect & past participle Constrained ; present participle & verbal noun Constraining .] [ Old French constraindre , French contrainde , Lati...
   Found on http://www.encyclo.co.uk/webster/C/144
   
   
4. Constrain
   • (v. t.) To bring into a narrow compass; to compress. • (v. t.) To violate; to ravish. • (v. t.) To hold back by force; to restrain; to repress. • (v. t.) To produce in such a manner as to give an unnatural effect; as, a constrained voice. • (v. t.) To compel; to force; to ...
   Found on http://thinkexist.com/dictionary/meaning
   
   
5. constrain
   constrain 1. To compel by physical, moral, or circumstantial force; oblige: 'We felt constrained to object to the way he was treating the dog.' 2. To keep within close bounds; to confine: 'He had a life that had been constrained by habit to the same few activities and friends.' 3. To inhibit or re...
   Found on http://www.wordinfo.info/words/index/inf