Definition of tierras:
(N) :
a computer simulation developed by ecologist Thomas S. Ray in the early 1990s in which computer programs compete for time (central processing unit time) and space (access to main memory).
(N) :
the second studio album by L'Arc-en-Ciel, released on July 14, 1994.
(N) :
an American Latin R&B band, originally from Los Angeles, California, United States, that was first established in 1972 by former El Chicano members Rudy Salas (guitar) and his brother Steve Salas (vocals).
(N) :
('Land') a weekly newspaper published from Almería, Spain.