(v. t.) To distribute into classes; to arrange according to a system\; to arrange in sets according to some method founded on common properties or characters.

alphabetize analyze appraise arrange assess assort bolt bosom break down catalog categorize class codify collate conceal digest divide evaluate factor file file and forget gauge gradate grade group hold out on identify in petto index keep keep back keep between us keep buttoned up keep close keep dark keep from keep in ignorance keep mum keep secret keep snug keep under wraps list make no sign never let on not give away not tell order pigeonhole place play dumb range rank rate riddle screen secrete separate sieve sift size sort sort out subdivide subordinate tabulate thrash out type veil weigh winnow withhold