Critical Mass Definition

noun
The minimum amount of fissile material that can sustain a nuclear chain reaction under a given set of conditions.
Webster's New World
The total mass of matter needed to generate sufficient gravitational force to halt the current expansion of the universe.
American Heritage
The minimum amount or number required for something to happen, begin, etc.
Webster's New World
The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
American Heritage
The total mass of matter needed to generate sufficient gravitational force to halt the current expansion of the universe.
American Heritage
pronoun

A direct action event in which bicycle riders travel through city streets as a group.

Wiktionary

Other Word Forms of Critical Mass

Noun

Singular:
critical mass
Plural:
critical-masses

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