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Webster 1913 Edition

(rămp′an-sy̆)

Noun.

The quality or state of being rampant; excessive action or development; exuberance; extravagance.

“They are come to this height and rampancy of vice.”

South.

Noun.

[from rampant.] Excessive growth or practice; excessive prevalence; exuberance; extravagance; as the rampancy of vice.

rampancy ‎(usually uncountable, plural rampancies)