Meaning of HARDNESS in English
/hahrd"nis/ , n.
1. the state or quality of being hard: the hardness of ice.
2. a relative degree or extent of this quality: wood of a desirable hardness.
3. that quality in water that is imparted by the presence of dissolved salts, esp. calcium sulfate or bicarbonate.
4. unfeelingness or jadedness; callousness.
5. harshness or austerity, as of a difficult existence.
6. South Midland U.S. ill will; bad feelings: There's a lot of hardness between those two boys.
7. Mineral. the comparative ability of a substance to scratch or be scratched by another. Cf. Mohs scale .
8. Metall. the measured resistance of a metal to indention, abrasion, deformation, or machining.
[ bef. 900; ME hardnes, OE heardnes. See HARD, -NESS ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012