/ Dictionary / Index B branch line: Meaning and Definition of Find definitions for: branch' line" Pronunciation: [key] a rail line, directly or indirectly connected with a main line, having its own stations and service. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. branchlet branch point Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language