accede
Concise Oxford English Dictionary © 2008 Oxford University Press:
accede /əkˈsiːd/
▶verb (usu. accede to) formal
- 1 assent or agree to.
- 2 assume (an office or position).
– origin ME: from L. accedere, from ad- ‘to’ + cedere ‘give way, yield’.
'accede' also found in these Oxford entries:

