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1.
1. An area of land; ground:
2. A particular geographic area; a region:
3. The surface features of an area of land; topography
Ex: I climbed a tree to view the surrounding terrain.
Ex: there is a guide who knows this terrain well.
by michael chi November 30, 2005
 
2.
A way to describe someone you have slept with. That person is your terrain.
"Julie? Yep, she's my terrain.
by Dylan Hewson April 20, 2005