Definition of split-second
(Entry 1 of 2)
1
: occurring in a split second
a split-second decision
2
: extremely precise
split-second timing
split second
nounDefinition of split second (Entry 2 of 2)
: a fractional part of a second : flash
Test Your Vocabulary
Name That Food
-
- Name these cookies!

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share split-second
Time Traveler for split-second
The first known use of split-second was in 1912
See more words from the same year