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1.
A (according to Google) very common misspelling of the word 'spontaneity'.
George: Hey Rhonda do you find there's a well balanced amount of spontinuity in your life?

Rhonda: You spelled 'spontinuity' wrong, dumbass.

George: The hell? How can you tell how I spell words when I'm talking to you?!
by Devin Alexander August 13, 2006
 
2.
"Wow you're always so spontaneous, you have such spontinuity!"
by Andrew Mackay April 18, 2007
 
3.
The ability to be spontaneous; the ability to keep a girlfriend.
"Why don't you take your girlfriend to Greece? That would increase your spontinuity."
by Lord Osmo January 11, 2006