irreversible

[ir-i-vur-suh-buhl]

ir·re·vers·i·ble

[ir-i-vur-suh-buhl]
adjective
not reversible; incapable of being changed: His refusal is irreversible.

Origin:
1620–30; ir-2 + reversible

ir·re·vers·i·bil·i·ty, ir·re·vers·i·ble·ness, noun
ir·re·vers·i·bly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Irreversible is a GRE word you need to know.
So is irreducible. Does it mean:
incapable of being rectified, remedied, or made good
incapable of being diminished or simplified further
Collins
World English Dictionary
irreversible (ˌɪrɪˈvɜːsəbəl)
 
adj
1.  not able to be reversed: the irreversible flow of time
2.  not able to be revoked or repealed; irrevocable
3.  chem, physics capable of changing or producing a change in one direction only: an irreversible reaction
4.  thermodynamics (of a change, process, etc) occurring through a number of intermediate states that are not all in thermodynamic equilibrium
 
irreversi'bility
 
n
 
irre'versibleness
 
n
 
irre'versibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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