The state of lacking freedom; constraint.
The state of being enslaved or the practice of slavery.
The practice of physically restraining people for sexual pleasure, such as by tying up or shackling.
Applied to clothing with many buckles, zips, etc., associated with punk and goth subcultures.
The permanent oppression of a nominally free group of people
A form of mutualism in which one species is forced to perform tasks for another, for their mutual benefit