Definition of octavo in English:


Syllabification: oc·ta·vo
Pronunciation: /äkˈtävō
(abbreviation: 8vo)

noun (plural octavos)

1A size of book page that results from the folding of each printed sheet into eight leaves (sixteen pages).
More example sentences
  • Folded one more time, the sheet produces a book-sized format call an octavo.
  • Faulkner's monument is the edition of Swift's Works issued in twenty octavo volumes in 1772.
  • The first number of the Boston Journal of Natural History appeared in 1834 and continued through seven octavo volumes until it was declared complete in 1863.
1.1A book of octavo size.
More example sentences
  • The five volumes consisted of an octavo of 786 pages of descriptive matter and four imperial folios containing 213 plates.


late 16th century: from Latin in octavo 'in an eighth', from octavus 'eighth'.

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