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From The Collaborative International Dictionary of English v.0.48:
Obtrusion \Ob*tru"sion\, n. [L. obtrusio. See Obtrude.] 1. The act of obtruding; a thrusting upon others by force or unsolicited; as, the obtrusion of crude opinions on the world. [1913 Webster] 2. That which is obtruded. --Milton. [1913 Webster]