What is another word for "promise"?

Roget's Thesaurus (1911) lists these synonyms for "promise": abide, about, accede, accept, acceptance, accession, according, acknowledge, acknowledgment, acquiesce, acquiescence, acquit, acquittal, acquittance, act, activity, adhere, adhesion, adjustment, admit, adventure, affiance, agent, agnition, agnize, agree, agreement, air, airy, all, allow, anchor, and, anticipation, anvil, apparent, apparently, appearance, apprentice, approval.