a person, group, or company that makes a complaint, as in a legal action.

1375–1425; late Middle English < Anglo-French compleignant (present participle of compleindre). See complain, -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
complainant (kəmˈpleɪnənt)
law a person who makes a complaint, usually before justices; plaintiff

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1490s (n. and adj.), from Fr. complaignant, prp. of complaindre (see complain). The prp. also was used as a noun in M.Fr.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Another dawns with the prisoner in court, but no complainant.
The press cannot afford this, even if they win they still have their costs and
  the complainant has none.
In a civil action against an existing permit holder, the burden of proof would
  be on the complainant to show harm.
Complainant is elderly and ambulates with the use of aids, ie, a walker or
  wheel chair.
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