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- hardnesse (obsolete)
- (General American) enPR: härdʹnəs, IPA(key): /ˈhɑɹdnəs/
- (Received Pronunciation) IPA(key): /ˈhɑːdnəs/
Audio (US) (file)
- Hyphenation: hard‧ness
- The quality of being hard.
- An instance of this quality; hardship.
- (inorganic chemistry) The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).
- The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
- (physics) The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
- The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.
- (countable, engineering) A measure of how hard a material is
- The hardness of the material was high.
quality of being hard
- “hardness”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.