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Webster's Dictionary (1865)

In-tru'sion, n.

noun

(-tru'zhun), n. [L. Lat. intrusio, Fr. & Sp. intrusion, It. intrusione. See INTRUDE.] 1. The act of intruding, or of entering into a place or state without invitation, right, or welcome; encroachment. Why this intrusion? Were not my orders that I should be private? Addison.

  1. (Geol.) The penetrating of one rock, while in a melted state, into the cavities of other rocks. Dana.
  2. (Law.) The entry of a stranger, after a particular estate of freehold is determined, before him in remainder or reversion. Blackstone.