Congratulate

google

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mid 16th century: from Latin congratulat- ‘congratulated’, from the verb congratulari, from con- ‘with’ + gratulari ‘show joy’ (from gratus ‘pleasing’).

wiktionary

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Borrowed from Latin congratulor, congratulatus, from gratus(“blessing”).

etymonline

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congratulate (v.)

"address with expressions of sympathetic pleasure," 1540s, from Latin congratulatus, past participle of congratulari "wish joy," from assimilated form of com "together, with" (see con-) + gratulari "give thanks, show joy," from gratus "agreeable" (from suffixed form of PIE root *gwere- (2) "to favor"). Related: Congratulated; congratulating; congratulable.