big; large; great; vast; high in scale or intensity; (of a person) old; adult

The largest river in Southeast Asia, which originates in the Tibetan Plateau and flows through China (where it is called the 澜沧江 lán​cāng​jiāng), Laos, Myanmar, Thailand, Cambodia, and Vietnam.

(bound form) order; sequence; next in sequence or importance; second; secondary

region; zone; district; area within a certain boundary