/ Dictionary / Index P porosity: Meaning and Definition of Find definitions for: po•ros•i•ty Pronunciation: (pô-ros'i-tē, pō-, pu-), [key] — pl. -ties the state or quality of being porous. the ratio, expressed as a percentage, of the volume of the pores or interstices of a substance, as a rock or rock stratum, to the total volume of the mass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: porosity (Thesaurus) pornography porous Related Content Daily Word Quiz: jovial Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language