additionner bedeutet auf Englisch

add [added, adding, adds]▼◼◼◼(to make an addition; to augment; to increase; to add on)
verb
[UK: æd] [US: ˈæd]

add [added, adding, adds]▼◼◼◼(to perform the arithmetical operation of addition, to add up)
verb
[UK: æd] [US: ˈæd]

sum [summed, summing, sums]▼◼◼◻(to add together)
verb
[UK: sʌm] [US: ˈsəm]

add up▼◼◼◻(take a sum)
verb
[UK: æd ʌp] [US: ˈæd ʌp]

cast [cast, casting, casts]▼◼◻◻(to add up a column of figures)
verb
[UK: kɑːst] [US: ˈkæst]

tot up▼(to calculate the sum of)
verb
[UK: tɒt ʌp] [US: ˈtɑːt ʌp]