The word 'opera' has one of the most deceptively mundane etymologies in the arts: it means simply 'work.' Or more precisely, 'works' — for 'opera' is the Latin plural of 'opus,' and the art form was named with an unremarkable noun that happened to stick.
The story begins in late sixteenth-century Florence, where a group of intellectuals, poets, and musicians known as the Camerata sought to revive what they believed to be the musical practices of ancient Greek drama. They theorized that Greek tragedies had been sung throughout, not merely spoken, and set out to create a modern equivalent: staged dramatic works set entirely to music. Jacopo Peri's 'Dafne' (c. 1597, mostly lost) and 'Euridice' (1600) are the earliest surviving examples.
These creators called their new works 'opera in musica' — literally 'a work in music' — or sometimes 'dramma per musica' (drama through music). The fuller term was soon abbreviated to simply 'opera,' and by the first decades of the seventeenth century, the word had attached itself permanently to this new art form. Claudio Monteverdi's 'L'Orfeo' (1607) is the earliest opera still regularly performed today.
The Latin word 'opera' (work, effort, service) is the feminine singular noun derived from 'opus' (neuter, meaning 'work, a piece of work'). In late Latin, 'opera' came to function as both the plural of 'opus' and as an independent singular noun meaning 'work' or 'effort.' This ambiguity — singular or plural? — persists in the English word: we say 'an opera' (singular) while the Latin form is technically plural, and the English plural 'operas' adds an English plural marker to an already-plural Latin word.
The Latin 'opus' derives from Proto-Indo-European *h₃ep- (to work), a root that also produced Sanskrit 'apas' (work, action) and possibly Old English 'efnan' (to perform). In English, the root has been enormously productive through Latin borrowings: 'operate' (to work), 'operation' (a working), 'cooperate' (to work together), 'opus' (a musical or literary work, borrowed directly), and 'magnum opus' (great work). The medical sense of 'operation' (a surgical procedure) extends the metaphor of skilled labor.
The diminutive 'operetta' (a little opera) appeared in the eighteenth century and came to denote lighter, shorter works with spoken dialogue — the tradition of Offenbach, Gilbert and Sullivan, and Johann Strauss II. 'Opera buffa' (comic opera) and 'opera seria' (serious opera) are Italian genre terms that became international classifications.
Opera spread rapidly from Italy to the rest of Europe. French opera developed its own traditions under Jean-Baptiste Lully in the court of Louis XIV. German opera emerged more slowly, with significant works by Mozart, Weber, and eventually Wagner, who developed his concept of 'Gesamtkunstwerk' (total work of art) — the idea that opera should be a synthesis of all the arts. English opera has a more intermittent history, with notable contributions from Purcell, Britten, and others.
The word 'opera' also appears in several English compound terms with no musical connection. 'Opera glasses' (small binoculars for theater use), 'opera house' (a theater designed for opera performance), and 'soap opera' (a serialized radio or television drama, so called because early series were sponsored by soap manufacturers) all draw on the word's association with dramatic performance.
The journey of 'opera' from a generic Latin word meaning 'works' to the name of one of the most elaborate and expensive art forms in human culture is a reminder that even the grandest cultural phenomena can bear the most ordinary names. What the Florentine Camerata created was revolutionary; what they called it was simply 'work.'