A declaration, written or verbal, made by one person to another ... to do or forbear a certain act specified. ... A binding declaration of something to be done or given. ... That which is promised; fulfillment or grant of what is promised.
volume 2, leaf 371, columns 1-2 (noun entry, bounded senses 1, 3, and 5)
To make a declaration to another ... to do or forbear some act. ... To make declaration or give assurance of some benefit to be conferred; to pledge or engage to bestow.
volume 2, leaf 371, column 2 (transitive verb entry, bounded senses 1 and 3)