Latin evocare: Roman armies practiced evocatio literally, calling out the enemy city's tutelary god before sack, offering it a better temple in Rome. Ritual magic inherited the verb for calling spirits forth, evocation, distinguished from invocation, calling in, into yourself or your circle.
The word's second career: criticism's favorite verb, her prose evokes the coast, the sacred summons demoted to a compliment for description. The demon is now a mood; the circle is now a paragraph.
Vocare and vox built voice, vocal, vocabulary, vow, advocate, provoke, revoke, vocation (the calling), and convocation. The entire institution of speech, oaths, jobs, assemblies, summonses, is one verb: the call. Magic just kept the oldest ringtone.
What is the difference between summoning a demon and describing rain well?