rit.

from WordNet (r) 3.0 (2006)
rit.
    adj 1: gradually decreasing in tempo [syn: {rallentando},
           {ritardando}, {ritenuto}, {rit.}]
    
from The Collaborative International Dictionary of English v.0.48
Rit \Rit\, obs.
   3d pers. sing. pres. of {Ride}, contracted from rideth.
   --Chaucer.
   [1913 Webster]
    

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