The Collaborative International Dictionary of English v.0.48:

Ariolation \Ar`i*o*la"tion\, n. [L. ariolatio, hariolatio, fr.
   hariolari to prophesy, fr. hariolus soothsayer.]
   A soothsaying; a foretelling. [Obs.] --Sir T. Browne.
   [1913 Webster]