1. A musical interval of eight tones
   "The singer demonstrated her range by effortlessly singing a musical octave";
   - musical octave
    
2. A rhythmic group of eight lines of verse
   "The first eight lines of a Petrarchan sonnet form an octave"
    
3. A feast day and the seven days following it
   "The octave of Easter is an important period in the Christian calendar"

Derived forms: octaves

Type of: church festival, interval, musical interval, religious festival, stanza

Encyclopedia: Octave, comte de Ségur