in re·rum na·tu·ra
| \ -ˈrārəmnəˈtu̇rə, -ˈrēr- \
Definition of in rerum natura
: in the nature of things in the world of nature as distinguished from the world of human beings : in the realm of material things
they do not signify anything in rerum natura— R. F. McRae
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Merriam-Webster unabridged
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