IPA: /ˌɒpəˈtjuːn/
KK: /ɑːpərˈtun/
Happening at a good or suitable time, making it favorable for a specific situation or purpose.
The rain was opportune for the farmers, as it helped their crops grow.
Opportune is derived from the Latin "opportunus" (meaning favorable or suitable), which is formed from "ob-" (meaning towards) and "portus" (meaning harbor or port). The word conveys the idea of something that is favorable or suitable, as if it arrives at the right time like a ship coming into a safe harbor.
Think of something that arrives 'towards' a 'harbor' — that's why 'opportune' means favorable or suitable timing.