accede

To agree or assent [with to ‘a proposal, a request’]; to give way.

to accede to a request

It was added that if he acceded to these proposals, his fortresses and sea-ports should be garrisoned by French and Spanish troops to protect him from England’s vengeance, but that if he refused—and the answer was to be given within four days—he must take the consequences of such a line of policy.

To come to an office, state or dignity; to attain, assume (a position) [with to].

the house of Hanover acceded to the English throne

Maintenon had been governess to the children in the late 1670s before acceding to the king's favours.

To become a party to an agreement or a treaty [with to].

to accede to the European Union

To approach; to arrive, to come forward.

To give one's adhesion; to join up with (a group, etc.); to become part of.