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

  • prep. In reference to. See Usage Note at participle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Causing concern; worrisome.
  • prep. Regarding, respecting.
  • v. Present participle of concern.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Important.
  • n. That in which one is concerned or interested; concern; affair; interest.
  • n. Importance; moment; consequence.
  • n. Concern; participation; interposition.
  • n. Emotion of mind; solicitude; anxiety.
  • prep. Pertaining to; regarding; having relation to; respecting; as regards.

from The Century Dictionary and Cyclopedia

  • Having interest or moment; important.
  • Pertaining to; regarding; with relation to; as to; about.
  • n. An affair of importance; concern; business.


from Wiktionary, Creative Commons Attribution/Share-Alike License

From concern +‎ -ing. The adjective and preposition follow from the verb.



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