Where does “gratulatory” come from?
gratulatory (English) comes from Latin gratulatorius, from Latin grātulor, from Latin grātus, from Proto-Italic grātos, from Proto-Indo-European gʷr̥Htós, from Proto-Indo-European gʷerH- — to express approval; praise; to elevate.
gratulatory (English): congratulatory
Ancestry of “gratulatory”, step by step