资料来源 : Webster's Revised Unabridged Dictionary (1913)

Graduality \Grad"u*al"i*ty\, n.
   The state of being gradual; gradualness. [R.] --Sir T.
   Browne.

资料来源 : WordNet®

graduality
     n : the quality of being gradual or of coming about by gradual
         stages [syn: {gradualness}]