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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.
spontinuity n. Combined form of spontaneous and continuity. A continual ability to be spontaneous.

"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