/ Dictionary / Index H heat of fusion: Meaning and Definition of Find definitions for: heat' of fu'sion Pronunciation: [key] — Physics. Physics. the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature: equal to the heat of solidification. Cf. latent heat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heat of condensation heat of solidification Related Content Daily Word Quiz: rotund Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language