1. noun /beɪs/
a) Something from which other things extend; a foundation.
A safe zone in the childrens games of tag and hide-and-go-seek
b) A supporting, lower or bottom component of a structure or object.
The logarithm to base 2 of 8 is 3.
2. verb /beɪs/
a) To have as its foundation or starting point.
Firstly, I continue to base most species treatments on personally collected material, rather than on herbarium plants.
b) To be located (at a particular place).
3. adjective /beɪs/
If thou livest in paine and sorrow, thy base courage is the cause of it, To die there wanteth but will.
Wikipedia foundation.