claim·ant /'klā-mənt/ n: one that asserts a claim esp. formally

Merriam-Webster’s Dictionary of Law. . 1996.

I noun accusant, accuser, appellant, applicant, asserter, ciaimer, complainant libelant, litigant, one who asserts a demand, one who claims a right, party to a suit, person who makes a claim, person with a grievance, petitioner, plaintiff, pleader, postulant, solicitant, solicitor, suitor associated concepts: lien claimant, subsequent claimant, suit by claimant foreign phrases:
- Semper necessitas probandi incumbit ei qui agit. — The burden of proof always lies upon the claimant.
II index applicant (petitioner), complainant, contender, contestant, litigant, party (litigant), plaintiff, suitor

Burton's Legal Thesaurus. . 2006

One who makes a claim.

The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. . 2008.

1) The party who brings a court action (called a plaintiff before April 1999). In employment law, an individual (formerly an applicant) who has issued a claim in an employment tribunal.
2) The person who brings the court action.
3) The person making the discrimination claim.
Related links

Practical Law Dictionary. Glossary of UK, US and international legal terms. . 2010.

n. An individual or entity who asserts a right or demand to money or property.

Webster's New World Law Dictionary. . 2000.