Webster's English Dictionary

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celerity

ce.ler.i.ty \s*-'ler-*t-e-\ n [ME celerite, fr. MF ce`le`rite`, fr. L 
   celeritat-, cel]eritas, fr. celer swift : rapidity of motion : SWIFTNESS 
   ement or action. CELERITY implies speed in accomplishing work; ALACRITY 
   stresses promptness in response to suggestion or command; LEGERITY implies 
   lightness and ease as well as swiftness of movement SYN syn CELERITY, 
   ALACRITY, LEGERITY mean quickness in mov