What does the word invocation mean?

Usage examples for invocation

  1. After the invocation to the muse he thinks he hears her playing: Hark! – The Satyricon, Complete by Petronius Arbiter
  2. First with groans, equally inarticulate murmurs of assent, shouts of " Glory," and the reckless invocation of sacred names. – A Protegee of Jack Hamlin's and Other Stories by Bret Harte
  3. Make your device and I shall not fail in the invocation! – The Sky Is Falling by Lester del Rey