extravagance

Use the noun extravagance when you're talking about something that's over the top, especially when it comes to spending money. Ordering a $500 hamburger for dinner would be an extravagance.

Money is usually the subject when people talk about extravagance, although the word can also mean having too much of something, whether it's anger or flowery wallpaper. In Latin, the root word extravagari means "wander outside or beyond," and originally extravagance was used to describe something that was unusual — "wandering outside" the norm. It wasn't until the 1700s that the word became associated specifically with spending too much money.

Definitions of extravagance
  1. noun
    the quality of exceeding the appropriate limits of decorum or probability or truth
    “we were surprised by the extravagance of his description”
    synonyms: extravagancy
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    type of:
    excess, excessiveness, inordinateness
    immoderation as a consequence of going beyond sufficient or permitted limits
  2. noun
    the trait of spending extravagantly
    synonyms: prodigality, profligacy
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    type of:
    improvidence, shortsightedness
    a lack of prudence and care by someone in the management of resources
  3. noun
    excessive spending
    synonyms: high life, highlife, lavishness, prodigality
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    type of:
    dissipation, waste, wastefulness
    useless or profitless activity; using or expending or consuming thoughtlessly or carelessly
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