Also found in: Dictionary, Acronyms.
At or on a certain time or date; commencing on or from a certain time or date. As of Monday, an interim governor will take over duties until an emergency election is held. As of 9 AM, we've learned that as many as five companies are involved in the insider trading scandal.
as of(slightly formal)
at the time mentioned The price was not finalized as of this morning. Alex told his boss that as of the end of this month, he wouldn't be working here.
From, at, or until a given time. For example, As of five o'clock the store will be closed for inventory, or As of last December our meetings have been open to the public, or As of now I'm not sure how I'll vote. This idiom was first used in business but came into more general use. [c. 1900]