definition of
constraint

[1] #1 constraint n. [restraint] the state of being physically constrained; "dogs should be kept under restraint". wn

[2] #2 constraint n. [restraint] a device that retards something's motion; "the car did not have proper restraints fitted". wn

[3] #3 constraint n. the act of constraining; the threat or use of force to control the thoughts or behavior of others. wn