The Collaborative International Dictionary of English v.0.48:
Accede \Ac*cede"\, v. i. [imp. & p. p. Acceded; p. pr. & vb.
n. Acceding.] [L. accedere to approach, accede; ad + cedere
to move, yield: cf. F. acc['e]dere. See Cede.]
1. To approach; to come forward; -- opposed to recede.
[Obs.] --T. Gale.
2. To enter upon an office or dignity; to attain.
Edward IV., who had acceded to the throne in the
year 1461. --T. Warton.
If Frederick had acceded to the supreme power.
3. To become a party by associating one's self with others;
to give one's adhesion. Hence, to agree or assent to a
proposal or a view; as, he acceded to my request.
The treaty of Hanover in 1725 . . . to which the
Dutch afterwards acceded. --Chesterfield.
Syn: To agree; assent; consent; comply; acquiesce; concur.