[ ok-tey-voh, -tah- ]
/ ɒkˈteɪ voʊ, -ˈtɑ- /
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noun, plural oc·ta·vos for 2.
a book size of about 6 × 9 inches (16 × 23 centimeters), determined by printing on sheets folded to form 8 leaves or 16 pages. Symbols: 8vo, 8°
a book of this size.
in octavo.
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The rainy weather could not ________ my elated spirits on my graduation day.
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Origin of octavo

First recorded in 1575–85; short for New Latin in octāvō “in an eighth (of a sheet)”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use octavo in a sentence

British Dictionary definitions for octavo

/ (ɒkˈteɪvəʊ) /

noun plural -vos
Also called: eightvo a book size resulting from folding a sheet of paper of a specified size to form eight leavesdemi-octavo Often written: 8vo,
a book of this size
(formerly) a size of cut paper 8 inches by 5 inches (20.3 cm by 12.7 cm)

Word Origin for octavo

C16: from New Latin phrase in octavo in an eighth (of a whole sheet)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012