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summate

[suhm-eyt] /ˈsʌm eɪt/
verb (used with object), summated, summating.
1.
to add together; total; sum up.
Origin
1895-1900
1895-1900; back formation from summation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for summated

summate

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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13
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