promise
UK: ˈprɒmɪs | US: ˈprɑːmɪs
n. a declaration or assurance that one will do something or that a particular outcome will happen
vt. to assure someone that one will definitely do something or that something will happen
n. potential or likelihood of future success or excellence (e.g., "a young artist of great promise")
The word "promise" originates from Latin promissum (a vow, literally "something sent forth"), derived from promittere ("to send forward, pledge"). The components pro- (forward) and mittere (to send) combine to convey the idea of "declaring something will be done in the future." Over time, it evolved in Old French as promesse before entering Middle English with its modern meaning of a commitment or assurance.
She made a promise to return the book by Friday.
The company promised to deliver the goods within two days.
His early work showed great promise.
I can't promise I'll be there, but I'll try.
Breaking a promise can damage trust in a relationship.