plural baselines
1
technical
: information that is used as a starting point by which to compare other information
The experiment is meant only to provide a baseline for other studies.
—often used before another nounbaseline data
2
: a line at either end of the playing area in games like basketball and tennis
3
baseball
a
: either one of the lines that lead from home plate to first base and third base
b
Cite this Entry
“Baseline.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/baseline. Accessed 17 Jun. 2026.
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