Literally, a wandering beyond a limit; an excursion or sally from the usual way, course or limit.

In writing or discourse, a going beyond the limits of strict truth, or probability; as extravagance of expression or description.

Excess of affection, passion or appetite; as extravagance of love, anger, hatred or hunger.

Excess in expenditures of property; the expending of money without necessity, or beyond what is reasonable or proper; dissipation. The income of three dukes was not enough to supply her extravagance.

In general, any excess or wandering from prescribed limits; irregularity; wildness; as the extravagance of imagination; extravagance of claims or demands.