An engagement, betrothal, or fiancer is a promise to wed, and also the period of time between a marriage proposal and a marriage. During this period, a couple is said to be betrothed, "intended", affianced, engaged to be married, or simply engaged. Future brides and grooms may be called the betrothed, a wife-to-be or husband-to-be, fiancée or fiancé, respectively (from the French word fiancer). The duration of the courtship varies vastly, and is largely dependent on cultural norms or upon the agreement of the parties involved.