'Jiāguān' literally means 'to add a cap' and refers to the ancient Chinese coming-of-age ceremony for young men, typically held at age twenty. The character '加' (jiā) means 'to add' or 'to bestow,' while '冠' (guān) means 'cap' or 'crown'—specifically the formal headdress symbolizing adulthood and social responsibility. This rite marked the transition from boyhood to manhood, entailing ritual purification, the donning of ceremonial robes and headgear, and the receiving of an adult-style courtesy name.

Though no longer practiced as a living custom, 'jiāguān' appears frequently in historical texts, classical literature, and modern discussions of Confucian rites and traditional Chinese culture. It is often paired with '及笄' (jíjī), the equivalent ceremony for young women. The term carries strong connotations of maturity, duty, and scholarly or moral cultivation—not merely biological age but the assumption of ethical and civic roles within the family and community.