Synonyms of the word

summative

• adj. Of, pertaining to, or produced by summation.

additive

• adj. (mathematics) Pertaining to addition; that can be, or has been, added.
• adj. (mathematics, of a function, etc.) Distributive over addition.
• adj. (algebra) Having addition as an operator.
• adj. (chemistry) Pertaining to chemical addition.
• adj. (genetics) Describing genes (or the interaction etc. of such genes) which govern the same trait and whose…
• n. A substance added to another substance or product for its ability to alter its properties.
• n. (grammar) A word or phrase that adds something, such as also, even, or nor.

summational

• adj. Of or pertaining to summation.