An "irreversible process" refers to a change or action that cannot be undone or reversed once it occurs. It is like making a permanent decision or causing a lasting impact that cannot be changed back. Full definition
Are these conflicting tendencies «natural» ones, irreversible processes resulting from changes in society? (educationnext.org)
By unknown means eggs reset the normally irreversible processes of differentiation and aging. (carnegiescience.edu)
Nobody really knows why time marches always forward, as the universe grows bigger and irreversible processes within it generate increasing disorder. (sciencenews.org)