ottava

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ot·ta·va

O0149300 (ō-tä′və)adv. & adj. Music At an octave higher or lower than the notes written. Used chiefly as a direction, positioned above or below a staff.
[Italian (all')ottava, (at the) octave, from Medieval Latin octāva, from Latin, feminine of octāvus, eighth; see octave.]

ottava

(əʊˈtɑːvə) n (Classical Music) an interval of an octave. See all'ottava[Italian: octave]

ot•ta•va

(oʊˈtɑ və)

adv. (of notes in a musical score) at an octave higher or lower than written. Abbr.: 8va [1810–20; < Italian: octave]