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Definition of immediately : 1. As soon as. Cf. Directly, 8, Note.
2. In an immediate manner; without intervention of any other person or thing; proximately; directly; - opposed to mediately; as, immediately contiguous.
3. Without interval of time; without delay; promptly; instantly; at once.

Synonyms:

before you could say Jack Robinson, on the double, at present, in real time, straightaway, now, nowadays, near, straightway, straight off, this instant, in a trice, at a time, rapidly, instanter, at short notice, at the first opportunity, outright, on the spot, in a flash, now or never, direct, like a shot, at one time, straight, in a jiffy, flat, pronto, right off the bat, instant, on the dot, directly, without delay, right off, shortly, in that instant, presently, unhesitatingly, clear, PDQ, summarily, time, today

approximately, locally, nearly, closely, adjacently

contemporarily, contemporaneously, currently

promptly, sharply, expeditiously, swiftly, right away, precisely, forthwith, straight away, punctually, speedily

hastily, precipitously, abruptly, unexpectedly, instantly, at once, all of a sudden, suddenly, instantaneously, quickly

timelessly

Usage examples:

• Miss Wilton immediately left the room. - "The Children of Wilton Chase", Mrs. L. T. Meade.
• Do, pray, answer this letter immediately. - "Leigh Hunt's Relations with Byron, Shelley and Keats", Barnette Miller.
• Therefore, when I came in the morning to him he said,- 'My will must be made immediately. - "When London Burned", G. A. Henty.