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Definition of impingement : The act of impinging.

Synonyms:

intrusion, obtrusion, bump, crash, enter, shock, strike, jar, encroachment, jounce, impact, impacted tooth, slam, invasion, collision, trespass, smash, violation, wallop, impaction, usurpation, jolt, entrenchment, concussion, kick, infringement

Usage examples:

• After her first burst of disappointment Joan began to take the mishap as she had taken Tess's original trouble, as she would have taken a wet holiday or failure in the potato- crop; as a thing which had come upon them irrespective of desert or folly; a chance external impingement to be borne with; not a lesson. - "Tess of the d'Urbervilles A Pure Woman", Thomas Hardy.
• Eight forms of electric lamps using infusible earthy oxides and brought to high incandescence in vacuo by high potential current of several thousand volts; same character as impingement of X- rays on object in bulb. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.
• At such moments the five members of the " Eureka Mining Company" prudently withdrew to the nearest pine- tree, which cast a shadow so sharply defined on the glistening sand that the impingement of a hand or finger beyond that line cut like a knife. - "From Sand Hill to Pine", Bret Harte.