(1):

(n.) That which settles or finishes; hence, a blow, etc., which settles or decides a contest.

(2):

(n.) Especially, one who establishes himself in a new region or a colony; a colonist; a planter; as, the first settlers of New England.

(3):

(n.) A vessel, as a tub, in which something, as pulverized ore suspended in a liquid, is allowed to settle.

(4):

(n.) One who settles, becomes fixed, established, etc.