magnetic flux mag·ne·ticf·lux uncommon noun 1. a measure of the strength of a magnetic field over a given area Synonymsmagnetic flux 2. the lines of force surrounding a permanent magnet or a moving charged particle Synonymsmagnetic fieldmagnetic fluxflux Related words Word family magnetic flux densitymagnetic flux unit Broader terms fieldmagnetization Narrower terms magnetospheresolar magnetic fieldflux unit WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.