›very unusual, special, or unexpected: extraordinary accomplishment/achievement/effortIt's an extraordinary accomplishment to be able to run a successful project for 40 years.After a rough start, this year is shaping up to be a year of extraordinary growth for the company.
›[before noun]ACCOUNTINGused to describe a large cost or loss that does not happen regularly: The oil spill was handled as an extraordinary expense - a non-recurring, one-time event.
›[before noun]used to describe something that does not happen regularly but that is arranged for a special purpose : They convened an extraordinary meeting of shareholders to discuss the issue.