Webster's English Dictionary

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audit

1. au.dit \'o.d-*t\ n [ME, fr. L auditus act of hearing, fr. auditus, pp.] 
   1a: a formal or official examination and verification of an account book  
   1b: a methodical examination and review  2: the final report of an 
   examination of books of account by auditors 
2. audit vt 1: to examine with intent to verify  2: to attend (a course) 
   without working for or expecting to receive formal credit