octave

/ˈɑktɪv/
noun
  1. The interval between one musical note and another note with double or half its frequency; a series of eight notes on a musical scale.
    • She practiced playing scales across two octaves on the piano.
    • The singer's voice could easily reach the high octave.
    • The guitar has a range of about three octaves.
  2. A group of eight lines of poetry, especially the first eight lines of a sonnet.
    • In the octave, the poet describes the beauty of the landscape.
    • He memorized the octave of his favorite Shakespearean sonnet.
    • The sonnet begins with an octave that introduces the main theme.
  3. A group or set of eight things.
    • The team won an octave of games in a row.
    • The octave of planets in our solar system includes Earth.
    • She collected an octave of rare stamps from the 19th century.
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