n. A block of the Earth's crust that differs from the surrounding material, and is separated from it by faults.
the GNU version of the Collaborative International Dictionary of English
n. A group of rocks having a common age or origin; -- nearly equivalent to formation, but used somewhat less comprehensively.
n. A region or limited area considered with reference to some special feature.
The Century Dictionary and Cyclopedia
n. See terrain.
Word Usage
"Rural Mexico has a lot in common with many other countries I have traveled in to climb mountains - rugged terrane, wide open spaces, dusty roads and poverty."