1) having clean personal habits (cleanly)
2) the scientific study of the habits of living things, especially their relation to their environment (ecology)
3) decided and fixed; (of opinions, habits etc) fixed and not to be changed; unmoving; a group of games (in tennis etc); a group of similar things; the position (of the body, clothes etc) (set)
the (good or bad) way a person behaves; treatment shown towards others
manner of conducting oneself