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summate

[suhm-eyt]
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verb (used with object), sum·mat·ed, sum·mat·ing.
  1. to add together; total; sum up.
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Origin of summate

First recorded in 1895–1900; back formation from summation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for summated

summate

v.

1900, Modern Latin summatus, past participle of summare "to sum" (see summation). Related: Summated; summating.

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Online Etymology Dictionary, © 2010 Douglas Harper