incantation

Concise Oxford English Dictionary © 2008 Oxford University Press:
incantation/ɪnkanˈteɪʃn/

▶noun a series of words said as a magic spell or charm.

– derivatives
incantatory adjective.

– origin ME: via OFr. from late L. incantatio(n-), from L. incantare ‘chant, bewitch’, based on cantare ‘sing’.