Etymology
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baseline (n.)

also base-line, "line upon which others depend," 1750, originally in surveying, from base (n.) + line (n.). In tennis, the end-line of the court (1872). Baseball diamond sense is from 1867. Baseline estimate in use by 1983.

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Definitions of baseline

baseline (n.)
an imaginary line or standard by which things are measured or compared;
the established a baseline for the budget
baseline (n.)
the back line bounding each end of a tennis or handball court; when serving the server must not step over this line;
Synonyms: service line
baseline (n.)
the lines a baseball player must follow while running the bases;
From wordnet.princeton.edu