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message unit

American  

noun

  1. a measure of the duration of and distance covered by local telephone calls, used by telephone companies as a basis for assessing service charges.

Etymology

Origin of message unit

First recorded in 1960–65

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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