Longman Dictionary of Contemporary English - whenever

~ adv, conjunction 1 every time that a particular thing happens  (Whenever we come here we see someone we know. | If you feed a baby whenever he is hungry, you will have less difficulty with him later.) 2 at any time  (I'd like to see you whenever it's convenient.) 3 spoken used when it does not matter what time something happens, or when you do not know the exact time something happens  ("Should I come over around six?" "Whenever.")