|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|2.||not able to be revoked or repealed; irrevocable|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|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|a scrap or morsel of food left at a meal.|
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