1. restriction, limitation, rule, regulation

usage: a principle that limits the extent of something; "I am willing to accept certain restrictions on my movements"

2. limitation, restriction, regulation, regulating

usage: an act of limiting or restricting (as by regulation)

3. restriction, confinement, restraint

usage: the act of keeping something within specified bounds (by force if necessary); "the restriction of the infection to a focal area"

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See also: restriction (Dictionary)