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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