Hardening1. (p. pr. & vb. n.) of Harden.
2. (n.) Making hard or harder.
3. (n.) That which hardens, as a material used for converting the surface of iron into steel.
Thesaurus Entries
abidingness, acclimation, acclimatization, accommodation, accustoming, adaption, adjustment, agglutination, arteriosclerosis, atherosclerosis, breaking, breaking-in, calcification, callusing, case hardening, changelessness, clumping, clustering, compression, concentration, concretion, condensation, conditioning, consolidation, constancy, cornification, crystallization, densification, domestication, durability, durableness, duration, endurance, familiarization, firming, firmness, fixedness, fortification, fossilization, frozenness, granulation, habituation, hornification, housebreaking, immobility, immovability, immovableness, immutability, induration, indurative, inurement, invariability, invariableness, inveteracy, invigoration, lapidification, lastingness, lithification, long standing, naturalization, orientation, ossification, permanence, permanency, perpetualness, persistence, persistency, petrifaction, petrifactive, petrification, petrifying, quiescence, refreshment, reinforcement, reinvigoration, restrengthening, revivification, rigidity, sclerosis, seasoning, setting, solidification, solidity, stability, standing, stasis, steadfastness, steeling, stiffening, strengthening, taming, tempering, torpor, toughening, training, unchangeability, unchangingness, vitrifaction, vitrification