Etymology
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mezzo (adj.)

"half, moderate," Italian mezzo, literally "middle," from Latin medius (from PIE root *medhyo- "middle"). Used in combinations such as mezzo-soprano (music, 1753); mezzo-rilievo (scuplture, 1590s); mezzotint (engraving, 1738).

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mezzo-soprano (n.)

in music, the part between soprano and contralto, 1753; see mezzo + soprano.

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mezzotint (n.)
1738; see mezzo + tint. As a verb, from 1827.
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*medhyo- 
Proto-Indo-European root meaning "middle." Perhaps related to PIE root *me- (2) "to measure."

It forms all or part of: amid; intermediate; mean (adj.2) "occupying a middle or intermediate place;" medal; medial; median; mediate; medieval; mediocre; Mediterranean; medium; meridian; mesic; mesial; meso-; meson; Mesopotamia; Mesozoic; mezzanine; mezzo; mezzotint; mid (prep., adj.); middle; Midgard; midriff; midst; midwife; milieu; minge; mizzen; moiety; mullion.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit madhyah, Avestan madiya- "middle," Greek mesos, Latin medius "in the middle, between; from the middle," Gothic midjis, Old English midd "middle," Old Church Slavonic medzu "between," Armenian mej "middle."
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