Webster's English Dictionary

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thorough

1. thor.ough \'th*r-(.)o-, -*(-w); 'th*-(.)ro-, -r*(-w)\ pp [ME thorow, fr. 
   OE thurh, thuruh, prep. & adv.] archaic  : THROUGH 
2. thorough av archaic  : THROUGH 
3. thorough aj 1: carried through to completion : EXHAUSTIVE {~ search}  
   2a: marked by full detail {~ description}  2b: careful about detail : 
   PAINSTAKING {~ scholar}  2c: complete in all respects {~ pleasure}  2d: 
   having full mastery (as of an art) {~ musician}  3: passing through  - 
   thor.ough.ly av