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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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