The word 大会 is formed through the combination of two individual characters, each contributing its core meaning to create a new, composite concept. The first character, 大 (dà), carries the fundamental meaning of "big" or "large", conveying a sense of scale or importance. The second character, 会 (huì), essentially means "gathering", "meeting", or "assembly". When these two are joined, the concept is not merely additive but synthetic, where 大 modifies the nature of 会, resulting in the overall meaning of a "large-scale formal meeting" or "congress", such as a national convention or a major conference.