Meaning of INSTANTANEOUS in English

adjective Etymology: Medieval Latin instantaneus, from instant-, instans, noun Date: 1651 done, occurring, or acting without any perceptible duration of time , done without any delay being purposely introduced , occurring or present at a particular instant , instantaneity noun ~ly adverb ~ness noun

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.