Webster's English Dictionary

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source

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  1. origin                
 
source \'so-(*)rs, 'so.(*)rs\ n [ME sours, fr. MF sors, sourse, fr. OF, fr. 
   pp. of sourdre] to rise, spring forth, fr. L surgere - more at SURGE 1a: 
   the point of origin of a stream of water : FOUNTAINHEAD  archaic  1b: 
   SPRING, FOUNT  2a: a generative force : CAUSE  2b1: a point of origin  2b2: 
   one that initiates : AUTHOR; also : PROTOTYPE, (MMODEL 2b3: one that 
   supplies information  3: a firsthand document or primary reference work