Webster's English Dictionary

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cogent

Cross references:
  1. valid                 
 
co.gent \'ko--j*nt\ aj [L cogent-, cogens, prp. of cogere to drive 
   together, collect], fr. co- + agere to drive - more at AGENT : having power 
   to compel or constrain; esp : appealing forcibly t o the mind or reason : 
   CONVINCING - co.gent.ly av