Top Definition
(Adjective): Trying to be daring and audacious in a big way.

Combination of 'significant' and 'defiant'.
"Cyclists blocked car traffic as part of their signifiant campaign to force the city to create more bike lanes."

"Dude, trying to chat up that hot girl you had no chance with was signifiant!"
by Skai February 09, 2009
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