/keuhn grach"euh leuhnt/ or, often, /-graj"-, keuhng-/ , adj.
1. expressing or conveying congratulation.
n.
2. a person who congratulates.
[ 1660-70; congratulant- (s. of congratulans, prp. of congratulari ), equiv. to con- CON- + gratul- ( grat-, s. of gratus pleasing + -ul- adj. suffix) + -ant- -ANT ]