subderivative

English

Etymology

From 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.

Related terms

• subdifferential
• subgradient