Definition of disputant in US English:

disputant

noun

  • 1A person engaged in a dispute or disagreement.

    ‘he endeavored to induce disputants to settle their quarrels out of court’
    1. 1.1 A person who argues about a subject, especially in a formal manner.
      ‘his reputation as both a disputant and a negotiator was well established’

Pronunciation

disputant

/dɪˈspjutnt//diˈspyo͞otnt/