A verb meaning chanting or reciting a formula with a joyful intonation and rhythm. The related noun "Vitulatio" was an annual thanksgiving offering carried out by the pontiffs on 8 July, the day after the "Nonae Caprotinae". These were commemorations of Roman victory in the wake of the Gallic invasion. Macrobius says "vitulari" is the equivalent of Greek "paianizein" (παιανίζειν), "to sing a paean", a song expressing triumph or thanksgiving.