if

conjunction10

1. •
   in the possible situation, used to name a condition for something else to happen or be true

   • I'll do it next week if I have time.
   • I'll come only if you do the driving.
2. •
   A keyword that invokes conditional processing: in the event that a given condition is true, execute the given statement(s) (otherwise execute other statements).
3. •
   Supposing that; used with past or past perfect subjunctive to indicate a counterfactual or hypothetical condition.

   • If she hadn't told me, I wouldn't know.
   • If I was rich, I'd live in a big house by the sea.
4. •
   Whether; used to introduce a noun clause, an indirect question, that functions as the direct object of certain verbs.

   • I don't know if I want to go or not.
5. •
   Introducing a relevance conditional; in case.

   • I have leftover cake if you want some.
   • If you want to go home, I have the car keys.
6. •
   When; whenever; every time that.

   • If you heat water to 100° C, it boils.
   • If it rains, it pours.
7. •
   Even if; even in the circumstances that.

   • I wouldn't marry you if you were the last man on earth.
   • You're finishing your chowder if you sit there all afternoon!
8. •
   Although; used to introduce a concession; may..but.

   • He was a great friend, if a little stingy at the bar.
   • She won her team's admiration, if not the award, for her performance.
9. •
   Considering the fact that; given that; introducing a condition that is known to be true.

   • The drain's blocked — and if the drain's blocked, the water won't flow.
10. •
    (rare) While; used to introduce a contrast.

    • If his Russian was music, his English was murder. — 1957

noun1

1. •
   (informal) An uncertainty, possibility, condition, doubt etc.

   • The board can't approve this project; there are too many ifs.

noun7

1. •
   Initialism of intermittent fasting.
2. •
   Initialism of interactive fiction.
3. •
   Initialism of impact factor.
4. •
   Initialism of intermediate frequency.
5. •
   Initialism of international federation.
6. •
   Initialism of intermediate filament.
7. •
   Initialism of immunofluorescence.