Definition of "instantaneous" []

• Occurring or completed without perceptible delay: Relief was instantaneous. (adjective)
• Done or made as quickly or directly as possible: an instantaneous reply to my letter. (adjective)
• Present or occurring at a specific instant: instantaneous velocity; instantaneous pressure. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Academic bloggers find that their community of readers often act as fact-checkers or engage the blogger in instantaneous debate over specific points before the book reaches the concretized state of print."
• "We desire to speak of those photographic apparatus called instantaneous shutters."
• "Accordingly, Birchcliff encourages its shareholders to focus on quarterly average production rates and not short term instantaneous production numbers that are very high but not sustainable."