active mass

noun

Chemistry.

1. the effective concentration of a substance.

Word History and Origins

Origin of active mass¹

First recorded in 1905–10

Example Sentences

Pita has maintained iTV was not an active mass media organisation.

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Eventually, he adds, “all active mass movements strive . . . to interpose a fact-proof screen between the faithful and the realities of the world.”

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But for a time the Tea Party was the most active mass movement in American politics and its influence on the Republican Party cannot be overstated.

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The French secondary army in Switzerland was in the hands of the bold and active Mass�na.

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At week's end active mass resistance appeared to have been suppressed.

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