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mesolithic (adj.)

1866 in archaeology, "belonging to the middle Stone Age (in Europe, roughly 15,000 to 5,000 years before the present, between the paleolithic and the neolithic);  see meso- "middle" + lithic "consisting of stone." The word was used c. 1859 in a different sense in geology.

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Definitions of mesolithic from WordNet
1
mesolithic (adj.)
of or relating to a middle period of the Stone Age (following the paleolithic);
2
Mesolithic (n.)
middle part of the Stone Age beginning about 15,000 years ago;
Synonyms: Mesolithic Age / Epipaleolithic
From wordnet.princeton.edu