A group of eight verse lines forming the first part of a sonnet (in its Italian or Petrarchan form); or a stanza of eight lines. In the first and most frequently used sense, an octave usually rhymes abbaabba. In the second sense, it may also be called an octastich. The Spanish stanza form known as octavas reales is the equivalent of ottava rima. See also huitain, ottava rima, triolet.