Breadcrumb Home > Dictionary > Index A A supply: Meaning and Definition of Find definitions for: A supply Pronunciation: [key] — Electronics. Electronics. a battery or other source of power for heating the filament or cathode heater of an electron tube. Cf. B supply, C supply. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. asunder Asur TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: raconteur Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language