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dozen (doz or dz)
a familiar unit of quantity equal to 12. Division into units of 12
rather than 10 has the advantage that 12 can be evenly divided into
halves, thirds, or quarters. For this reason, units of 12 have been
common since the earliest civilizations of the Middle East. "Dozen"
comes from an old French word dozaine related to the Latin word
duodecem, "twelve."