The term 'START OF A CAROL' is composed of three crossword solutions: ADESTE (6 letters), OCOME (5 letters), and OCOMEALL (8 letters). These words are Latin phrases that are traditionally used to begin Christmas carols. Adeste is a form of the verb 'adesto, ' which means 'to be present.' Ocome is a form of the verb 'venio, ' which means 'to come.' Ocomeall is a form of the verb 'VENITE, ' which means 'to come all.' Together, these three phrases mean 'be present, come, come all, ' and are often used to invite people to join in singing a carol.