comenzar
/komenˈθaɾ/ · A1 · verb
to begin, to commence
🏁 comenzar = commence: same Latin root, com- + initiare (to initiate)
Both comenzar and English commence come from Vulgar Latin *cominitiare: com- (together) + initiare (to begin). Swap the Spanish -zar ending for -ce and you nearly have the English word. Stem-changing: comienzo, I begin.