if (EN)

conjunction, noun

conjunction “if”

1. used to introduce a condition or choice, meaning "assuming that"
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   If you study hard, you will pass the exam.
2. used to suggest a hypothetical situation with a past or past perfect subjunctive, meaning the condition cannot change
   She would have arrived on time if she had caught the earlier train.
3. although (used to introduce a statement that makes the main statement seem surprising or unlikely)
   She's very talented, if somewhat lazy.
4. means "whether," used to introduce an indirect question or a choice
   She asked if he would be attending the party.
5. used to introduce a statement that explains the relevance of the condition to the discussion
   If it rains tomorrow, we will cancel the picnic.

noun “if”

1. an informal way to refer to something uncertain
   Winning the lottery is a big if, considering the odds are so low.