Definition of split-second
- a split-second decision
- split-second timing
In a split second, it was all over.
a devastating accident can cause everything in your life to change in a split second
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'split second.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: done very quickly
: very accurate or precise
: a very short period of time
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