Source : Webster's Revised Unabridged Dictionary (1913)

Parusia \Pa*ru"si*a\, n. [NL., fr. Gr. ? presence, fr. ? to be
   present; ? beside + ? to be.] (Rhet.)
   A figure of speech by which the present tense is used instead
   of the past or the future, as in the animated narration of
   past, or in the prediction of future, events.