Lao (Adjective) — Of or relating to a member of the Buddhist people inhabiting the Mekong river in Laos and Thailand.
Lao (Noun) — The Tai language of a Buddhist people living in the area of the Mekong River in Thailand and Laos.
Lao (Noun) — A member of a Buddhist people inhabiting the area of the Mekong River in Laos and Thailand and speaking the Lao language; related to the Thais.