NOUN (2)

1. the largest continent with 60% of the earth's population; it is joined to Europe on the west to form Eurasia; it is the site of some of the world's earliest civilizations;

2. the nations of the Asian continent collectively;

WordNet (r) 3.0 (2006):

Asia
    n 1: the largest continent with 60% of the earth's population;
         it is joined to Europe on the west to form Eurasia; it is
         the site of some of the world's earliest civilizations
    2: the nations of the Asian continent collectively