Etymology
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millisecond (n.)

"one thousandth of a second," by 1901, from milli- + second (n.).

updated on February 01, 2019

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Definitions of millisecond from WordNet

millisecond (n.)
one thousandth (10^-3) of a second;
Synonyms: msec
From wordnet.princeton.edu, not affiliated with etymonline.