noun pl. opera o′pera (ō′pə rə, äp′ə rə) or opuses o′pus·es
a work; composition; esp., any of the musical works of a composer numbered in order of composition or publication
Etymology:
L, a work < IE *ops < base *op-, to work, riches > L ops, riches, Sans ápas-, work, OE efnan, to work, do
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