"constraints" in the noun sense
1. constraint, restraint
the state of being physically constrained
"dogs should be kept under restraint"
2. restraint, constraint
a device that retards something's motion
"the car did not have proper restraints fitted"
3. constraint
the act of constraining the threat or use of force to control the thoughts or behavior of others
Source: WordNet® (An amazing lexical database of English)
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