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congratulant

[kuh n-grach-uh-luh nt or, often, -graj-, kuh ng-]
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adjective
  1. expressing or conveying congratulation.
noun
  1. a person who congratulates.

Origin of congratulant

1660–70; < Latin congrātulānt- (stem of congrātulāns, present participle of congrātulārī), equivalent to con- con- + grātul- (grāt-, stem of grātus pleasing + -ul- adj. suffix) + -ant- -ant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018