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WordReference Random House Learner's Dictionary of American English © 2024in•stan•ta•ne•ous /ˌɪnstənˈteɪniəs/USA pronunciation adj. - occurring or completed in an instant;
immediate:an instantaneous response.
in•stan•ta•ne•ous•ly, adv.: The image of the explosion was transmitted instantaneously all over the world. WordReference Random House Unabridged Dictionary of American English © 2024in•stan•ta•ne•ous (in′stən tā′nē əs),USA pronunciation adj. - occurring, done, or completed in an instant:an instantaneous response.
- existing at or pertaining to a particular instant:the instantaneous position of the rocket.
- Medieval Latin instantāneus. See instant, -an, -eous
- 1645–55;
- 1.See corresponding entry in Unabridged immediate, sudden, abrupt.
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