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Baseline (Noun)

The back line bounding each end of a tennis or handball court; when serving the server must not step over this line.

Nouns denoting spatial position.

The server stood behind the baseline, ready to launch the ball into the opponent's court.
To be considered a valid serve, the ball must clear the net and land beyond the baseline.
If the server's foot touches or crosses the baseline during the serve, a fault is called.
The player took a deep breath and stepped up to the baseline to serve for the match.
As she began her service motion, the lineswoman watched closely to ensure her foot did not cross the baseline.

An imaginary line or standard by which things are measured or compared; "the established a baseline for the budget".

Nouns denoting relations between people or things or ideas.

The lines a baseball player must follow while running the bases.

Nouns denoting spatial position.

The runner had to stay within the baseline to avoid being called out for deviating from the path.
The umpire warned the player to stay on the baseline or risk being penalized.
The coach reminded the team to always run along the baseline to avoid any disputes with the opposing team.
The player's foot touched the baseline, so the umpire called him out for leaving the base path.
The baseline was clearly marked with chalk, providing a clear guide for the runners to follow.