Webster's English Dictionary

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prolong

Cross references:
  1. extend                
 
pro.long \pr*-'lo.n\ \-'lo.n-*r\ vt [ME prolongen, fr. MF prolonguer, fr. 
   LL prolongare, fr. L Xpro- forward + longus long 1: to lengthen in time : 
   CONTINUE  2: to lengthen in extent, scope, or range {~ the boundary 
   northwar d} - pro.long.er n