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critical

critical critical mass originally, the minimum amount of fissile material needed to maintain a nuclear chain reaction. In extended usage, the minimum size or amount of resources required to start or maintain a venture.
critical path the sequence of stages determining the minimum time needed for an operation, especially when analysed on a computer for a large organization.

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"critical." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"critical." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/critical

"critical." The Oxford Dictionary of Phrase and Fable. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/critical

critical mass

crit·i·cal mass • n. Physics the minimum amount of fissile material needed to maintain a nuclear chain reaction. ∎ fig. the minimum size or amount of something required to start or maintain a venture: a communication system is of no value unless there is a critical mass of users.

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"critical mass." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"critical mass." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/critical-mass

"critical mass." The Oxford Pocket Dictionary of Current English. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/critical-mass

critical mass

critical mass Minimum mass of fissionable material required in a fission bomb or nuclear reactor to sustain a chain reaction. The fissionable material of a fission bomb divides into portions less than the critical mass; when brought together at the moment of detonation they exceed the critical mass. See also fission

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"critical mass." World Encyclopedia. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"critical mass." World Encyclopedia. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/critical-mass

"critical mass." World Encyclopedia. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/critical-mass

critical mass

critical mass: see chain reaction.

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"critical mass." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"critical mass." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/critical-mass

"critical mass." The Columbia Encyclopedia, 6th ed.. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/critical-mass