cumulative distribution function
Technical term in probability and statistics; often abbreviated as CDF.
The cumulative distribution function gives the probability that a random variable takes a value less than or equal to a given value.
Probability density function (PDF); for continuous distributions, the CDF is the integral of the PDF.
Compound of 累積 (cumulative) + 分布 (distribution) + 関数 (function), a direct translation of the English term.