/ Dictionary / Index L long account: Meaning and Definition of Find definitions for: long' account' Pronunciation: [key] — Finance. Finance. the account of a customer who buys securities or commodities on margin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. longa long-acting Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language