- baseline - an imaginary line or standard by which things are measured or compared; "the established a baseline for the budget"
--1 is a kind of standard, criterion, measure, touchstone
- service line, baseline - the back line bounding each end of a tennis or handball court; when serving the server must not step over this line
--2 is a kind of line
- baseline - the lines a baseball player must follow while running the bases
--3 is a kind of line
- service line, baseline - the back line bounding each end of a tennis or handball court; when serving the server must not step over this line