Etymology
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sublunary (adj.)

1590s, "situated under the moon," hence "earthly, mundane" (old cosmology), from Modern Latin sublunaris, from sub "under, beneath" (see sub-) + lunaris (see lunar). It owes its special sense to the old cosmology of heavenly spheres and ultimately to Aristotle:

The treatise On the Heavens sets forth a pleasant and simple theory. Things below the moon are subject to generation and decay; from the moon upwards, everything is ungenerated and indestructible. [Bertrand Russell, "A History of Western Philosophy"]

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Definitions of sublunary

sublunary (adj.)
situated between the earth and the moon;
Synonyms: sublunar / cislunar
sublunary (adj.)
of this earth;
transcendental motives for sublunary actions
fleeting sublunary pleasures
Synonyms: sublunar / terrestrial
From wordnet.princeton.edu