Seat  —n. 1 thing made or used for sitting on. 2 a buttocks. B part of a garment covering them. 3 part of a chair etc. On which the buttocks rest. 4 place for one person in a theatre etc. 5 position as an mp, committee member, etc., or the right to occupy it. 6 supporting or guiding part of a machine. 7 location (seat of learning). 8 country mansion. 9 manner of sitting on a horse etc. —v. 1 cause to sit. 2 provide sitting accommodation for (bus seats 50). 3 (as seated adj.) Sitting. 4 put or fit in position.  be seated sit down. By the seat of one's pants colloq. By instinct rather than knowledge. Take a seat sit down. [old norse: related to *sit]