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The Collaborative International Dictionary of English v.0.48 (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]