n. 25B6; conjunction
if the weather is fine, we can walk : ON CONDITION THAT, provided (that), providing (that), presuming (that), supposing (that), assuming (that), as long as, given that, in the event that.
if I go out she gets nasty : WHENEVER, every time.
I wonder if he noticed : WHETHER, whether or not.
a useful, if unintended innovation : ALTHOUGH, albeit, but, yet, whilst; even though, despite being.
25B6; noun there is one if in all this : UNCERTAINTY, doubt; condition, stipulation, provision, proviso, constraint, precondition, requirement, specification, restriction.