Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To prove or to refute by proof, especially on threat of combat.
  • v. To engage in (battle, combat etc.).

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To prove or to refute by proof; to clear (one's self).

from The Century Dictionary and Cyclopedia

  • In old English law, to prove; justify; vindicate, as an assertion; clear one's self, either by proving one's own case or by refuting that of an adversary: sometimes used of an abstract or chronologic tracing of a chain of title to real estate.
  • To claim and try to win by battle or combat; fight for.
  • To arrange (an army); draw up in order of battle.
  • To derange; disorder; disarrange.

Etymologies

From Old French deraisnier ("to explain, defend, to maintain in legal action by proof and reasonings"), from Late Latin derationare ("to discourse, contend in law"). (Wiktionary)

Examples

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