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Supposing that, assuming that, in the circumstances that; used to introduce a condition or choice. examples
(computing) In the event that a statement is true (a programming statement that acts in a similar manner). examples
Supposing that; used with past or past perfect subjunctive indicating that the condition is closed. examples
Supposing that; given that; supposing it is the case that. quotations examples
O what of Gods then boots it to be borne, / If old Aveugles ſonnes ſo euill heare?
1596, Edmund Spenser, “Book I”, in The Faerie Queene. […], part I (books I–III), London: […] [Richard Field] for William Ponsonbie, stanza ii, page 66
Although; used to introduce a concession. quotations examples
Both Spear & Davis were indicted in the witchhunt surrounding the sensational (if nonexistent) "Revere sex ring."
1981 April 11, Mitzel, “Kopacz Acquitted In Barbre Killing”, in Gay Community News, page 1
(sometimes proscribed) Whether; used to introduce a noun clause, an indirect question, that functions as the direct object of certain verbs. quotations examples
Quoth Matthew, “ […] / She doubts if two and two make four, / […] ”
1715–1717, Matthew Prior, Alma; or, The Progress of the Mind, Canto III
The former was divided between admiration of the brilliancy which exercices had given to her complexion, and doubt as to (if) occasion's justifying her coming so far alone.
1813, Jane Austen, chapter 7, in Pride and Prejudice
It is doubtful if the Victorian Londoner needed any warning, for the artful mobsmen, toolers, whizzers and dippers, together with their stickman accomplices, were everywhere in the crowds, in the underground, on railway trains […]
1976, Michael Harrison, Beyond Baker Street: A Sherlockian Anthology, page 117
plural ifs
(informal) An uncertainty, possibility, condition, doubt etc. quotations examples
Sir Fran. Nay, but Chargy, if——— ¶ Miran. Nay, Gardy, no Ifs.——Have I refus'd three northern lords, two British peers, and half a score knights, to have put in your Ifs?
1709, Susannah Centlivre, The Busy Body, Act III, in John Bell (ed.), British Theater, J. Bell (1791), page 59
Well might Bergman add, (in his Sciographia,), “if the compariſon that has been made, &c. be juſt.” The preſent writer makes no ifs about the matter, and has ſuperadded a little inaccuracy of his own, […]
1791 January, “Richardſon’s Chemical Principles of the Metallic Arts”, in The Monthly Review, R. Griffiths, page 176
Even if they managed to strike Japan, the United States or South Korea with nuclear weapons — a big if, given that they do not have a reliable delivery system — they could not save themselves from ultimate defeat.
2013 April 9, Andrei Lankov, “Stay Cool. Call North Korea’s Bluff.”, in New York Times