Definition of instantaneous adjective from the Oxford Advanced Learner's Dictionary

 

instantaneous

 adjective
adjective
BrE BrE//ˌɪnstənˈteɪniəs//
 
; NAmE NAmE//ˌɪnstənˈteɪniəs//
 
 
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happening immediately an instantaneous response Death was almost instantaneous. Word Origin mid 17th cent.: from medieval Latin instantaneus, from Latin instant- ‘being at hand’ (from the verb instare), on the pattern of ecclesiastical Latin momentaneus.
See the Oxford Advanced American Dictionary entry: instantaneous