if

I

(New American Roget's College Thesaurus)

conj. supposing, in case that, provided; whether. See supposition, qualification.

II

(Roget's IV) conj.

Syn. provided that, with the condition that, supposing that, conceding that, on the assumption that, granted that, assuming that, on the occasion that, whenever, wherever.

• as if,

Syn. as though, as the situation would be, in a way like; see apparently , as if 1 .