from The American Heritage® Dictionary of the English Language, 5th Edition.

  • intransitive verb To encroach on or limit something, such as a right.
  • intransitive verb Usage Problem To have an effect or influence.
  • intransitive verb To collide or strike against something.
  • intransitive verb To advance over or press upon something.
  • intransitive verb To encroach upon; limit.

from The Century Dictionary.

  • To come in collision; collide; strike or dash: followed by on, upon, or against.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To fall or dash against; to touch upon; to strike; to hit; to clash with; -- with on or upon.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive To make a physical impact (on); to collide, to crash (upon).
  • verb intransitive, figuratively To interfere with; to encroach (on, upon).
  • verb intransitive To have an effect upon; to limit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb advance beyond the usual limit
  • verb impinge or infringe upon


from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin impingere : in-, against; see in– + pangere, to fasten; see pag- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin impingō ("dash against, impinge").


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  • "Macklin argued that bioethics has done just fine with the principle of personal autonomy--the idea that, because all humans have the same minimum capacity to suffer, prosper, reason, and choose, no human has the right to impinge on the life, body, or freedom of another."

    - Steven Pinker, The Stupidity of Dignity,, 28 May 2008.

    September 29, 2009