subderivative

English

Etymology

sub- +‎ derivative

Noun

subderivative (plural subderivatives)

  1. (linguistics) A word derived indirectly, from a derivative of another.
    "Friendliness" is a subderivative: it is derived from "friendly", which comes from "friend".
  2. (mathematics) A generalization of the notion of a derivative, defined as the slope of a line that either touches, or is everywhere below the line of a convex function.
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