light speed

noun
|Updated on: 26 Jul 2018

Definition of light speed

: the speed of light
  • Accelerating particles to near light speed, such machines are ideal for smashing them to make exotic states of matter, blast out new particles, or even search for new dimensions of space.
  • —Adrian Cho
also, informal : an extremely fast rate or speed
  • A Netflix spokesman said it was adding titles at light speed while negotiating daily with studios, which have their own strategy for dealing with online distribution.
  • —Josh Quittner

Recent Examples of light speed from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'light speed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of light speed

1914

in the meaning defined above

See Words from the same year
NEW! Time Traveler

Seen and Heard

What made you want to look up light speed? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

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

WORD OF THE DAY

subject to rapid or unexpected change

Get Word of the Day daily email!

Test Your Vocabulary

The Eponym Quiz

  • rubens-painting
  • Which is the best synonym of bowdlerize?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

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