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From Middle English testifien, from Old French testifier, from Latin testificārī, present active infinitive of testificor (I bear witness), from testis (a witness) + facere (to make) (see -fy).


testify (third-person singular simple present testifies, present participle testifying, simple past and past participle testified) (intransitive or transitive)

  1. To make a declaration, or give evidence, under oath.
    • Bible, Numbers xxxv. 30
      One witness shall not testify against any person to cause him to die.
  2. To make a statement based on personal knowledge or faith.
    • Bible, John iii. 11
      We speak that we do know, and testify that we have seen; and ye receive not our witness.


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