summate vs add

summate and add both are verbs.

Word	Noun	Adjective	Verb	Adverb
summate	No	No	Yes	No
add	No	No	Yes	No

As verbs, summate and add are synonyms defined as:

Other synonyms of summate include add together, add up, sum, sum up, tally, tot, tot up, total, tote up.

summate (verb)	add (verb)
determine the sum of	make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of
form or constitute a cumulative effect	make an addition by combining numbers
	determine the sum of
	state or say further
	bestow a quality on
	constitute an addition