Webster's English Dictionary

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testify

tes.ti.fy \'tes-t*-.fi-\ vb [ME testifien, fr. L testificari, fr. testis 
   witness] 1a: to make a statement based on personal knowledge or belief : 
   bear wit ness 1b: to serve as evidence or proof  2: to express a personal 
   conviction  3: to make a solemn declaration under oath for the purpose of 
   establishing  a fact (as in a court) 1a: to bear witness to : ATTEST  1b: 
   to serve as evidence of : PROVE  archaic  2a: to make known (a personal 
   conviction) : PROFESS  2b: to give evidence of : SHOW  3: to declare under 
   oath before a tribunal or officially constituted publi c body