1. the quality or state of being extravagant; excessive spending or lavish expenditure
Usage: often used to describe wasteful or immoderate behavior with money
2. something extravagant; an instance of excessive or immoderate behavior
Usage: often plural; refers to specific acts or items that are wasteful or luxurious

Examples

• The king's extravagancy in building palaces nearly bankrupted the kingdom.
• Her extravagancy with designer clothes shocked her practical parents.
• The company criticized the CEO's extravagancy during the economic downturn.
• Such extravagancy was considered inappropriate for a public official.
• He warned against the extravagancy of spending money on unnecessary luxuries.
• The extravagancy of the wedding reception exceeded all reasonable expectations.