An Etymological Dictionary of Astronomy and Astrophysics
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1) Increasing or growing by accumulation or successive additions.
2) Formed by or resulting from accumulation or the addition of successive parts or elements (Dictionary.com). → cumulative distribution function.

→ cumulate; → -ive.

A function that gives the probability that a → random variable X is less than or equal to x, at each possible outcome: F(x) = P(X ≤ x), for -∞ < x < ∞. Same as → distribution function.

→ cumulative; → distribution; → function.