"to add, combine," 1900, from Medieval Latin summatus, past participle of summare "to sum" (see summation). Related: Summated; summating.
Entries linking to summate
summation n.
1760, "process of calculating a sum," from Modern Latin summationem (nominative summatio) "an adding up," noun of action from Late Latin summatus, past participle of summare "to sum up," from Latin summa (see sum (n.)). Meaning "a summing up" is from 1836.