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Fiancee from WikiPedia:

An engagement is a promise to marriage, and also the period of time between proposal and marriage – which may be lengthy or trivial. During this period, a couple is said to be affianced, betrothed, engaged to be married, or simply engaged. Future brides and bridegrooms are often referred to as fiancées (brides) or fiancés (grooms). Its duration varies vastly. See Courtship#Duration

Long engagements were once common in formal arranged marriages and it was not uncommon for parents betrothing children to arrange such many years before the engaged couple were old enough to marry.

The concept of an official engagement period in Western culture may have begun in 1215 at the Fourth Lateran Council, headed by Pope Innocent III, which decreed that "marriages are to be ... announced publicly in the churches by the priests during a suitable and fixed time, so that if legitimate impediments exist, they may be made known." Such a formal church announcement of the intent to marry is known as banns. In some jurisdictions, reading the banns may be part of one type of legal marriage.

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