Definitions

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

  • transitive verb To cause (a beam or a lens) to deviate from accurate focus.
  • noun The act or result of causing a lens to deviate from accurate focus.

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

  • verb To deliberately cause a lens, or a beam of light or particles, to be out of focus

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