level (nom)
Sens 1 : a line or surface parallel to the horizon, especially with reference to its
height. [source : OAL]
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Sens 2 : the position on a scale of quantity, strength, value, etc. [source : OAL]
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Sens 3 : the magnitude of a quantity considered in relation to an arbitrary
reference value. [source : MW]
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Sens 4 : a more or less flat surface, layer or area. [source : OAL]