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3.
a large amount of something
i went to the store and bought a plethera of Candy canes
by Colbyy December 10, 2007
 
1.
all different kinds
how many dildoes were there?

i dont know, but there was a whole plethera. im sore and i want to go home.
by panda_snack August 12, 2009
 
2.
a large group of pinatas.
there was a plethera of pinatas at his birthday.
by thisismyaccount60 December 22, 2010