Definition of Extravagancy

Babylon English Dictionary
profligacy, extravagance, lavishness, excess, immoderation
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Extravagancy Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
Extravagance.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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extravagancy
\ex*trav"a*gan*cy\ (?), n.; pl. extravagancies (&?;). extravagance.

WordNet 2.0

Noun
1. the quality of exceeding the appropriate limits of decorum or probability or truth; "we were surprised by the extravagance of his description"
(synonym) extravagance
(hypernym) excess, excessiveness, inordinateness