Dictionary.com Unabridged

harden

[hahr-dn]
verb (used with object)
1.
to make hard or harder: to harden steel.
2.
to make pitiless or unfeeling: to harden one's heart.
3.
to make rigid or unyielding; stiffen: The rigors of poverty hardened his personality.
4.
to strengthen or confirm, especially with reference to character, intentions, feelings, etc.; reinforce.
5.
to make hardy, robust, or capable of endurance; toughen.
6.
Military. to reinforce the structure of (a military or strategic installation) to protect it from nuclear bombardment.
verb (used without object)
7.
to become hard or harder.
8.
to become pitiless or unfeeling.
9.
to become rigid or unyielding; stiffen: His personality hardened over the years.
10.
to become confirmed or strengthened: His resistance hardened.
11.
to become inured or toughened: The troops hardened under constant fire.
12.
Commerce.
a.
to cease to fluctuate; firm: When the speculators withdrew from the market, the prices hardened.
b.
to rise higher.

Origin:
1150–1200; Middle English; see hard, -en1

hardenable, adjective
hardenability, noun
overharden, verb
preharden, verb (used with object)
reharden, verb
unharden, verb (used with object)
unhardenable, adjective


1. solidify, indurate; petrify, ossify. 4. fortify, steel, brace, nerve.


1. soften. 4. weaken.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To hardening
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World English Dictionary
harden1 (ˈhɑːdən)
 
vb
1.  to make or become hard or harder; freeze, stiffen, or set
2.  to make or become more hardy, tough, or unfeeling
3.  to make or become stronger or firmer: they hardened defences
4.  to make or become more resolute or set: hardened in his resolve
5.  (intr) commerce
 a.  (of prices, a market, etc) to cease to fluctuate
 b.  (of price) to rise higher

harden2 (ˈhɑːdən)
 
n
a rough fabric made from hards

hardening (ˈhɑːdənɪŋ)
 
n
1.  the act or process of becoming or making hard
2.  a substance added to another substance or material to make it harder

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The major signs of scleroderma are hardening and thickening of the skin in any
  areas on the fingers and toes.
It's as if our system is getting hardening of the arteries.
It comes at a time when views are slowly hardening against the current
  unreliable and expensive system.
It causes lots of scar formation in the arteries, hardening them.
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