complainant

noun

com·​plain·​ant kəm-ˈplā-nənt 

1

: the party who makes the complaint in a legal action or proceeding

2

: one who complains

Synonyms of complainant

• plaintiff

Examples of complainant in a Sentence

the complainant charged that the defendant had broken the ironclad contract that both had signed

Recent Examples on the Web

Then, on March 17th, the Marseille prosecutor’s office launched a preliminary criminal investigation into the complainant’s allegations. — News Desk, Artforum, 2 July 2026

At the same time, the Commission recently published a Fair Chance Hiring Intake Form that asks complainants whether the employer provided such information when notifying them of an intent to rescind a job offer or take other adverse action. — Alonzo Martinez, Forbes.com, 29 June 2026

Morgan has said previously that the other complainants were from players who were out of the team and had a grudge or issue with him. — Daniel Taylor, New York Times, 29 June 2026

Ontario Superior Court Justice Anne Molloy found Stronach guilty on Friday on two charges related to two complainants. — ABC News, 19 June 2026

Word History

First Known Use

15th century, in the meaning defined at sense 1

Kids Definition

complainant

noun

com·​plain·​ant kəm-ˈplā-nənt 

1

: one who makes a legal complaint

2

: one who complains

Legal Definition

complainant

noun

com·​plain·​ant kəm-ˈplā-nənt 

: the party (as a plaintiff or petitioner) who makes the complaint in a legal action or proceeding