A scale, ladder, or graduated measuring system, especially in astronomy and music; also used in French for ladder or musical scale.
From French 'échelle,' from Old French 'eschele,' derived from Latin 'scala' (ladder, staircase). The Latin root is also the origin of English 'scale.'
A single word captures both the metaphorical ladder of musical notes and the physical ladder of scientific measurement—this is why astronomers and musicians still use 'échelle' in their specialized terminologies.
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