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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 O·pus n.; pl. Opera   A work; specif. Mus., a musical composition.
 Note: ☞ Each composition, or set of pieces, as the composer may choose, is called an opus, and they are numbered in the order of their issue. (Often abbrev. to op.)
 Opus incertum.  Arch. See under Incertum.
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From: Webster's Revised Unabridged Dictionary (1913)

 In·cer·tum a. Doubtful; not of definite form.
 Opus incertum Anc. Arch., a kind of masonry employed in building walls, in which the stones were not squared nor laid in courses; rubblework.
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