1
: a line serving as a basis;
especially
: one of known measure or position used (as in surveying or navigation) to calculate or locate something
2 a
: either of the lines on a baseball field that lead from home plate to first base and third base and are extended into the outfield as foul lines
b
: basepath
3
: a boundary line at either end of a court (as in tennis or basketball)
4
: a usually initial set of critical observations or data used for comparison or a control
5
: a starting point
- the baseline of this discussion
