From Glossary of Meteorology
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  1. In common meteorological usage, a line of equal or constant value of a given quantity, with respect to either space or time;
    same as isogram.

  2. (Also called isarithm.) A line drawn through points on a graph at which a given quantity has the same numerical value (
    or occurs with the same frequency) as a function of the two coordinate variables.

    Compare isotimic line.

  3. A straight line along which lie corresponding values of a dependent and independent variable.