an ancient civilization that flourished in the Indus River valley, from about 2500 to 1500 b.c.: extensive archaeological excavations at the main sites of Mohenjo-Daro and Harappa in Pakistan.
of or designating a Mesoamerican civilization, c1000–400 b.c., along the southern Gulf coast of Mexico, characterized by extensive agriculture, a dating system, long-distance trade networks, pyramids and ceremonial centers, and very fine jade work.