incremental (adj) – increasing or adding in small or gradual steps
— an increment is the result or process of addition, increase, or growth
BREAKDOWN: IN- (into) + CRE- (grow) + -MENT (state of) + -AL (pertaining to)
This word is built on the root CRE-, which means to grow or increase.
Common CRE- words include crescent, crew, decrease, or increase.
More esoteric CRE- words include accretive and decremental.