/ Dictionary / Index L line of force: Meaning and Definition of Find definitions for: line' of force' Pronunciation: [key] — Physics. Physics. an imaginary line or curve in a field of force, as an electric field, such that the direction of the line at any point is that of the force in the field at that point. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. line of fire line of induction Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language