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Length is linear measure taken in a particular direction.
Length is the fundamental notion of Euclidean geometry, never defined but regarded as an intuitive concept at the basis of every geometrical theorem.
- 1952: T. Ewan Faulkner: Projective Geometry (2nd ed.) ... (previous) ... (next): $1.1$: Historical Note
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Entry: length