1. (verb) determine the sum of

• add
• add together
• add up
• sum
• sum up
• tally
• tot
• tot up
• total
• tote up

1. (verb) determine the sum of

• count
• enumerate
• number
• numerate

2. (verb) form or constitute a cumulative effect

• combine

1. (verb) determine the sum of

• addable
• addable
• addible
• addible
• adder
• addition
• addition
• plus
• plus
• summation
• summation
• additive
• additive
• linear
• aggregate
• aggregate
• aggregate
• sum
• sum
• sum
• total
• total
• total
• totality
• totality
• totality
• amount
• amount
• amount
• sum
• sum
• sum
• total
• total
• total
• count
• counting
• enumeration
• numeration
• reckoning
• tally
• sum
• sum
• sum total
• sum total
• summation
• summation

2. (verb) form or constitute a cumulative effect

• center
• centre
• core
• essence
• gist
• heart
• heart and soul
• inwardness
• kernel
• marrow
• meat
• nitty-gritty
• nub
• pith
• substance
• sum
• sum
• sum total
• summation