Definition of instantaneousnext
as in immediate
done or occurring without any noticeable lapse in time the thunder following the flash of lightning was nearly instantaneous

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of instantaneous But Turner will be remembered mostly for the creation and development of the Cable News Network – CNN – which launched in 1980 and made our knowledge of distant events instantaneous and our world more comprehensible. Michael J. Socolow, The Conversation, 7 May 2026 On an induction stove, the process is instantaneous. Ashlyn Needham, Southern Living, 4 May 2026 And the effects are instantaneous. Michelle Marchante, Miami Herald, 30 Apr. 2026 If frequency varies suddenly or power is lost, these unidirectional systems provide almost instantaneous, short-term backup power to the equipment inside the data center. IEEE Spectrum, 29 Apr. 2026 See All Example Sentences for instantaneous
Recent Examples of Synonyms for instantaneous
Adjective
  • Even with those immediate reductions, the overall multi-billion-dollar spending plan retains funding for most programs from the previous year.
    Ryan Macasero, Mercury News, 10 June 2026
  • Major ash-producing eruptions have repeatedly disrupted life across the region and can affect areas far beyond the immediate danger zone.
    Kaif Shaikh, Interesting Engineering, 9 June 2026
Adjective
  • Rwanda’s Central Bank Governor John Rwangombwa said the goal is instant, low-cost cross border payments.
    Tiisetso Motsoeneng, semafor.com, 8 June 2026
  • The sleeveless design is slightly sheer, so pair it with a camisole underneath for everyday wear or throw it over your swimsuit for instant poolside polish.
    Amanda Eyre Ward, Travel + Leisure, 8 June 2026

Browse Nearby Words

Cite this Entry

“Instantaneous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/instantaneous. Accessed 14 Jun. 2026.

More from Merriam-Webster on instantaneous

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster