Joyful times go hand in hand with congratulations. When addressing graduates, newlyweds, or anyone with good news, a hearty “Congratulations!” is in order. Don't be a sore loser, a fan of the winning team of the Super Bowl deserves a hearty congrats as well! (See next slide for another gracious congratulatory concession after a big game.)
Congratulants, people who congratulate, have been using this pluralized expression, which stems from the Latin gratus meaning “pleasing,” since the 17th century. The singular noun meaning “the act of congratulating” has been around since the late 16th century.