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Isoline may refer to:

  • Contour line (line of constant elevation or depth, sometimes used to describe other lines of constant value)
    • A line of constant value on a map or chart [1]. Examples include isobar (equal barometric pressure), isotherm (equal temperature), and isohyet (equal precipitation).
  • Isoline (opera), an opera by André Messager


[1] Merriam Webster dictionary