immediately UK /ɪˈmiː.di.ət.li/US /ɪˈmi.di.ɪt.li/adverb 2conjunction 1 adverb2 •at once, without waitingI hope we can begin immediately. •Without any intervening time or space.A tri-tone chime whistle, operated from the cab by a flexible cable passing down the right hand handrail, is mounted on the top of the smokebox immediately behind the chimney. — 1951 conjunction1 •As soon as, the moment that.My dog is an open book: immediately he smelled our dinner, he grew more interested in our activities.