/ Dictionary / Index I interfacial: Meaning and Definition of Find definitions for: in•ter•fa•cial Pronunciation: (in"tur-fā'shul), [key] — adj. included between two faces. of, pertaining to, or of the nature of an interface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: interfacial (Thesaurus) interface interfacial tension Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language