A person from the continent of Asia.
"When I visited Japan, I met a friendly Asian who showed me around the city."
In plain English: An Asian is someone who was born to parents from East, Southeast, or South Asia.
"The asian at the counter smiled warmly when I asked for directions."
Of, relating to or from Asia.
"The flight departs tomorrow morning for a stopover in Asia before heading home."
In plain English: Asian is an adjective used to describe something related to people from East, Southeast, or South Asia.
"The restaurant on Main Street is known for its delicious Asian cuisine."
The word comes from the Latin āsiānus, which originally meant "of Asia." In modern North American usage, it has evolved to refer collectively to people from East and Southeast Asia.