(1):

(n.) The act of one who, or that which, sets; as, the setting of type, or of gems; the setting of the sun; the setting (hardening) of moist plaster of Paris; the setting (set) of a current.

(2):

(n.) That in which something, as a gem, is set; as, the gold setting of a jeweled pin.

(3):

(n.) Something set in, or inserted.

(4):

(n.) The act of marking the position of game, as a setter does; also, hunting with a setter.

(5):

(p. pr. & vb. n.) of Set