commence

This term carries a high degree of formality and is typically reserved for official proceedings, legal documents, or ceremonial events. It suggests a structured or planned beginning rather than a spontaneous start, evoking an atmosphere of solemnity or professional rigor. In contrast to the common verb "start," which is versatile and casual, this word is rarely used in everyday conversation. Using it in a relaxed setting can sound overly stiff or pretentious, as it implies a formal initiation of a process.