Hardening

n.	1.	Making hard or harder.
	2.	That which hardens, as a material used for converting the surface of iron into steel.

Noun	1.	hardening - abnormal hardening or thickening of tissue
	2.	hardening - the process of becoming hard or solid by cooling or drying or crystallization; "the hardening of concrete"; "he tested the set of the glue" Synonyms: curing, solidification, solidifying, set
	3.	hardening - the act of making something harder (firmer or tighter or more compact)

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