<p><strong>Noun</strong></p><ul><li>Baseball: the area between bases within which a base runner must keep when running from one base to another.</li><li>Tennis: the line at each end of a tennis court, parallel to the net, that marks the in-bounds limit of play.</li><li>(in perspective drawing): a horizontal line in the immediate foreground formed by the intersection of the ground plane and the picture plane.</li><li>a basic standard or level; guideline: to establish a baseline for future studies.</li><li>a specific value or values that can serve as a comparison or control.</li><li>Typography: the imaginary line on which the bottoms of primary letters align.</li><li>Surveying: triangulation.</li><li>Electronics: a horizontal or vertical line formed on the face of a cathode-ray tube by the sweep of the scanning dot.</li><li>Naval Architecture: a line on the body plan or sheer plan of a hull, representing a horizontal reference plane for vertical dimensions.</li></ul>