Definify.com
Webster 1913 Edition
Porosity
Po-ros′i-ty
,Noun.
 [Cf. F. 
porosité
.] The quality or state of being porous; – opposed to density. 
Webster 1828 Edition
Porosity
POROS'ITY
,Noun.
 Definition 2025
porosity
porosity
English
Noun
porosity (countable and uncountable, plural porosities)
-  (uncountable) The state of being porous
-  2004, Frank Hamer; Janet Hamer, The Potter's Dictionary of Materials and Techniques, 5th edition, London; Philadelphia, Penn.: A & C Black; University of Pennsylvania Press, ISBN 978-0-7136-6408-9, page 248:
- An overfired biscuit has insufficient porosity for glazing.
 
 
 -  
 - (countable) A measure of how porous a material is; the ratio of the volume of pores to the total volume
 
Translations
state of being porous
measure of how porous a material is