A gliding in; an immission or entrance of one thing into another.(noun)
A sudden descent or attack.(noun)
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Use "illapse" in a sentence
"Democritus says that dreams are formed by the illapse of adventitious representations."
"And everything that moved is a body; and the voice moves, and having its illapse upon smooth places is reflected, as when a ball is cast against a wall it rebounds."
"Plato and the Stoics introduce divination as a godlike enthusiasm, the soul itself being of a divine constitution, and this prophetic faculty being inspiration, or an illapse of the divine knowledge into man; and so likewise they account for interpretation by dreams."