noun
a very brief moment of time
adjective
very quick or sudden
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The decision had to be made in a split second, with no time for hesitation.
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I saw the car swerve in a split second, but luckily I managed to avoid a collision.
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I can finish this race in a split second, watch me go!
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His words hit me like a ton of bricks, causing my heart to stop for a split second.