Meaning of “instantaneous” in the English Dictionary

"instantaneous" in British English

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instantaneousadjective

uk /ˌɪn.stənˈteɪ.ni.əs/ us /ˌɪn.stənˈteɪ.ni.əs/

(Definition of “instantaneous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"instantaneous" in American English

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instantaneousadjective [ not gradable ]

us /ˌɪn·stənˈteɪ·ni·əs/

happening or completed immediately, without any delay:

TV has conditioned us to expect instantaneous answers to difficult questions.
instantaneously
adverb [ not gradable ] us /ˌɪn·stənˈteɪ·ni·əs·li/

(Definition of “instantaneous” from the Cambridge Academic Content Dictionary © Cambridge University Press)