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Idioms and Phrases with by definition

by definition

According to prior determination, as a given. For example, This antibiotic is by definition the most effective now on the market. [1970s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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