Definition of in octavo in English:

in octavo

adverb

  • With leaves one-eighth of a standard printing sheet in size; in an edition having leaves of this size.

Origin

Late 16th century; earliest use found in Robert Parsons (1546–1610), Jesuit. From post-classical Latin in octavo in an eighth (sheet) from classical Latin in in + octāvo, ablative of octāvus eighth.

Pronunciation

in octavo

/ˌɪn ɒkˈteɪvəʊ//ˌɪn ɒkˈtɑːvəʊ/