(a) As indef. pron., referring to an abstraction: any one, any; (b) as rel. pron. introducing restrictive adj. clauses: as direct obj., referring to persons: whom; also, referring to things: which, that [difficult to distinguish from (c)]; (c) as an independent relative with indefinite or generalizing force introducing noun clauses, with clause functioning either as subj. [quot. a1382, 2nd] or as an appositive to a noun in main clause and with pron. as subj. in its own clause: whichever ones, those who, anyone or everyone who [1st quot. could also be construed as (b)].