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Verb: summate
Usage: rare
  1. Determine the sum of
    "You need to summate all the items on the receipt";
    - total, tot [Brit, informal], tot up [Brit, informal], sum, sum up, add, add together, tally, add up
     
  2. Form or constitute a cumulative effect
    "The various factors summated to create a perfect storm of economic instability"

Derived forms: summates, summating, summated

Type of: combine, count, enumerate, number, numerate