an irrevocable decision, action etc cannot be changed or stopped:
Think about the situation carefully before you take an irrevocable step.
machines that irrevocably changed the pattern of rural life
WORD FOCUS: change WORD FOCUS: change to change something:alter, adapt, adjust, amend, modify, revise, vary to change a system or organization:restructure, reorganize, reform to change something completely:transform, revolutionize to change facts or information, or change what someone has said:twist, distort, misrepresent easily changed:flexible, adaptable impossible to change:fixed, final, irrevocable ➔ See alsochange
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.