Webster's English Dictionary

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opera

1. opera  pl of OPUS 
2. op.era \'a:p-(*-)r*\ n [It, work, opera, fr. L, work, pains; akin to L 
   oper-, opus] 1: a drama set to music and made up of vocal pieces with 
   orchestral accompa niment and orchestral overtures and interludes 2: the 
   score of a musical drama  3: the performance of an opera or a house where 
   operas are performed