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Ronda Rousey is in a "great place mentally, physically and emotionally" ... and most importantly "she's ready to fight" -- so says UFC honcho Dana White.

Dana White isn't pulling punches when it comes to Jon Jones -- telling TMZ Sports his decision to cuss out a police officer was just plain DUMB.

This is awesome.

The blonde badass who lost her leg in the '13 Boston Marathon attacks is just weeks from running in the 2016 race ... and says she's ready to show the world those cowards couldn't break her spirit.