immediate
Word family
- immediatelyadverbB1
- immediacynounC1
Synonym discussion
Sense: adjective/1
All three words describe speed, but they highlight different aspects. 'Instant' suggests zero measurable delay — something happens in a single moment, like an instant message arriving on your phone. 'Prompt' emphasises efficiency and meeting an expected time frame; a prompt reply arrives soon after the message, though not necessarily within seconds. 'Swift' draws attention to the smooth, rapid movement of an action — a swift rescue implies well-coordinated speed rather than the absence of any pause. For most everyday situations where speed matters but a tiny gap is acceptable, 'immediate' fits naturally: 'the ambulance arrived within minutes' is an immediate response, while 'the ambulance arrived before the caller hung up' would be nearly instant. Choose 'prompt' when politeness and reliability matter more than raw speed, and 'swift' when describing a process that moves efficiently from start to finish.
Common collocations
Etymology
Comes from Latin 'immediatus', made up of 'in-' (not) and 'mediatus' (in the middle, intervening). The original sense was 'having nothing in between' — a direct spatial or logical connection. English borrowed it from French 'immediat' in the late 1500s, and by the 1600s writers had extended it from space to time, giving us the meaning 'without delay' that is most common today.