'baseline' definitions:

Definition of 'baseline'

From: WordNet
noun
An imaginary line or standard by which things are measured or compared; "the established a baseline for the budget"
noun
The back line bounding each end of a tennis or handball court; when serving the server must not step over this line [syn: service line, baseline]
noun
The lines a baseball player must follow while running the bases

Definition of 'baseline'

From: GCIDE
  • baseline \baseline\ n.
  • 1. an imaginary line or standard by which things are measured or compared; as, they established a baseline for the budget. [WordNet 1.5]
  • 2. the back line at each end of a tennis court. [WordNet 1.5]
  • 3. (Baseball) the lines between bases on a baseball field along which a baseball player must run while running the bases. [WordNet 1.5]
  • 4. a measurement that represents the value of a physical quantity (such as a voltage, or a level of radioactivity) in the absence of effects from other variables in a measurement, test or experiment; a control value. [PJC]
  • 5. any horizontal line in a plot, graph, or diagram, or on a visual display in an electronic device, used as a reference point to which other values are referred. [PJC]