WordReference Random House Learner's Dictionary of American English © 2019
oc•tave /ˈɑktɪv, -teɪv/USA pronunciation   n. 
    [countable]
  1. Music and Dance
    • a tone on the eighth degree from a given musical tone.
    • the interval between such tones.
  2. a series or group of eight.

WordReference Random House Unabridged Dictionary of American English © 2019
oc•tave  (oktiv, -tāv),USA pronunciation n. 
  1. Music and Dance
    • a tone on the eighth degree from a given tone.
    • the interval encompassed by such tones.
    • the harmonic combination of such tones.
    • a series of tones, or of keys of an instrument, extending through this interval.
  2. Music and Dancea pipe-organ stop whose pipes give tones an octave above the normal pitch of the keys used.
  3. a series or group of eight.
  4. PoetryAlso called  octet. [Pros.]
    • a group of eight lines of verse, esp. the first eight lines of a sonnet in the Italian form. Cf.  sestet (def. 1).
    • a stanza of eight lines.
  5. the eighth of a series.
  6. Religion[Eccles.]
    • the eighth day from a feast day, counting the feast day as the first.
    • the period of eight days beginning with a feast day.
  7. Wineone eighth of a pipe of wine.
  8. Sport[Fencing.]the eighth of eight defensive positions.

adj. 
  1. Music and Dancepitched an octave higher.
oc•ta•val  (ok tāvəl, oktə-),USA pronunciation adj. 
  • Latin octāva eighth part, noun, nominal use of feminine of octāvus, equivalent. to oct- oct- + -āvus adjective, adjectival suffix
  • 1300–50; Middle English


Collins Concise English Dictionary © HarperCollins Publishers::

octave /ˈɒktɪv/ n
  1. the interval between two musical notes one of which has twice the pitch of the other and lies eight notes away from it counting inclusively along the diatonic scale
  2. one of these two notes, esp the one of higher pitch
  3. (as modifier): an octave leap
  4. a rhythmic group of eight lines of verse
  5. /ˈɒkteɪv/ a feast day and the seven days following
  6. the final day of this period
  7. the eighth of eight basic positions in fencing
  8. any set or series of eight
adj
  1. consisting of eight parts
Etymology: 14th Century: (originally: eighth day) via Old French from Medieval Latin octāva diēs eighth day (after a festival), from Latin octo eight



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