a space reserved for sitting (as in a theater or on a train or airplane)

the fleshy part of the human body that you sit on

furniture that is designed for sitting on

any support where you can sit (especially the part of a chair or bench etc. on which you sit)

a center of authority (as a city from which authority is exercised)

the location (metaphorically speaking) where something is based

the legal right to sit as a member in a legislative or similar body

a part of a machine that supports or guides another part

the cloth covering for the buttocks