Definition of summate in English:

summate

Pronunciation /ˈsʌmeɪt/

verb

  • 1To add (two or more numbers or quantities) together; to calculate the sum of.

    In later use especially with reference to statistical data.

  • 2To combine (two or more things) together, especially so as to produce a cumulative effect, force, etc.

  • 3To produce (a result or outcome).

Origin

Mid 19th century. Back-formation from summation.