r (obsolete)which | Which of two. (defdate|11th-19th c.)
c (obsolete)(non-gloss definition|Introducing a direct interrogative question (often with correlative (term|or)) which indicates doubt between alternatives.)
c (non-gloss definition|Used to introduce an indirect interrogative question that consists of multiple alternative possibilities (usually with correlative (term|or))).
c (non-gloss definition|Without a correlative, used to introduce a simple indirect question); if, whether or not.
c (non-gloss definition|Used to introduce a disjunctive adverbial clause which qualifies the main clause of the sentence (with correlative (term|or)).)