the.com/baseline

The line everything else gets measured against, until something better makes it look quaint.

means A starting point or established level used as a fixed reference for comparison, measurement, or expectation.

from A straightforward English compound: 'base' (from Latin 'basis,' a foundation or pedestal, via Greek) plus 'line.' It started life literally — the bottom line of a survey, a triangle, or a court — and over time stretched into the figurative sense of a fixed reference everything else is judged against. Tennis kept the original, literal back line; science, finance, and project managers borrowed the metaphor.

tennis origin
Names the court's back boundary line in tennis
medical use
First reading doctors compare all later tests against
hidden everywhere
Charts, budgets, science, music all secretly start here
emotional version
Psychologists call your default mood a happiness baseline
for instance

wilkes-barre baseline — the starting point for all u.s. public land surveys, established 1769 in pennsylvania

principal meridian — paired with baselines to create the rectangular survey system dividing 1.5 billion acres of u.s. public land

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