An irresistible force or compulsion.
A condition that a solution to an optimization problem must satisfy.
A linkage or other restriction that maintains database integrity.
The repression of one's feelings.
Something that constrains; a restriction.
extortion
practices associated with vampires, in particular blood-drinking and the draining of a victim's life-force.
Systemic lupus erythematosus (autoimmune disease)
the state of being a vampire