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cad-, cas-, cid- (Latin: to fall, befall).


accident:
accidental:
cadaver:
cadaverous:
cadence:
cadent:
cadenza:
caducous:
cascade:
casual:
casualty:
coincide:
coincidental:
decadence:
decadent:
decay:
deciduous:
incidence:
incident:
incidental:
occasion:
occidental:
recidivism: