• Webster's Revised Unabridged Dictionary
    • n Illapse A gliding in; an immisson or entrance of one thing into another; also, a sudden descent or attack. "They sit silent . . . waiting for an illapse of the spirit."
    • v. i Illapse To fall or glide; to pass; -- usually followed by into.
    • ***
Century Dictionary and Cyclopedia
    • illapse To pass, glide, or slide: usually followed by into.
    • n illapse A gliding in or into; entrance as by permeation; influx: used especially of the descent of the Holy Spirit.
    • n illapse Inspiration; divine influx.
    • n illapse A falling on; onset.
    • ***
Chambers's Twentieth Century Dictionary
    • n Illapse il-laps′ a sliding in: the entrance of one thing into another
    • v.i Illapse to glide
    • ***


Webster's Revised Unabridged Dictionary
L. illapsus, p. p. of illabi,; pref. il-, in + labi, to fall, slide


In literature:

Metrodorus, that it is a forcible illapse of the sun upon clouds which makes them to sparkle as fire.
"Essays and Miscellanies" by Plutarch

In poetry:

Around her car the pensive Hours,
In sweet illapses meet the sight,
Crown'd their brows with closing flow'rs,
Rich with chystal dews of night.
"Evening" by Ann Radcliffe