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Constrain (verb) To pressuring; to compel; to oblige. 
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Constrain (verb) To keep within close bounds; to confine. 
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Constrain (verb) To reduce a result in response to limited resources. 
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Constraint (noun) Something that constrains; a restriction. 
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Constraint (noun) An irresistible force or compulsion. 
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Constraint (noun) A condition that a solution to an optimization problem must satisfy. 
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Constraint (noun) A linkage or other restriction that maintains database integrity. 
Wiktionary
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