Etymology
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surplus (n.)

late 14c., from Old French sorplus "remainder, extra" (12c., Modern French surplus), from Medieval Latin superplus "excess, surplus," from Latin super "over" (see super-) + plus "more" (see plus). As an adjective from late 14c.

updated on January 03, 2014

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Definitions of surplus from WordNet
1
surplus (n.)
a quantity much larger than is needed;
Synonyms: excess / surplusage / nimiety
2
surplus (adj.)
more than is needed, desired, or required;
surplus cheese distributed to the needy
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.