What is another word for "accession"?

Roget's Thesaurus (1911) lists these synonyms for "accession": accede, accept, acceptance, accompaniment, accretion, accrue, acknowledge, acknowledgment, acquiesce, acquiescence, add, addition, additional, adjection, adjustment, admit, advance, advene, affix, agency, agent, agentship, aggrandize, aggrandizement, aggravate, aggravation, agnition, agnize, agree, agreement, ahead, all, allow, and, annex, annexation, append, appointment, approval, ascend.