variation
n. C / Un. a change or difference in the amount or form of something. You use this when comparing things that are similar but not exactly the same.
n. a change or slight difference in condition, amount, or level, typically within certain limits. It can also refer to a different version of something that already exists.
There is a lot of variation in the price of coffee.
The chef created a delicious variation of the classic pasta dish by adding local seafood and spicy peppers.
Genetic variation within a population is essential for natural selection, as it allows certain individuals to adapt more effectively to changing environmental pressures over successive generations.
From Middle French variation, from Old French variacion, from Latin variātiō, from vary + -ation.
Uncountable when referring to the general concept of change; countable when referring to a specific instance or a different version of a thing.