Pronunciation: (ak-sēd'),[key] —v.i.,-ced•ed, -ced•ing. 1. to give consent, approval, or adherence; agree; assent; to accede to a request; to accede to the terms of a contract. 2. to attain or assume an office, title, or dignity; succeed (usually fol. by to): to accede to the throne. 3. Internat. Law.to become a party to an agreement, treaty, or the like, by way of accession.