Concussion

1. n. The unlawful forcing of another by threats of violence to yield up something of value.
2. n. A shaking or agitation; a shock; caused by the collision of two bodies.
3. n. A condition of lowered functional activity, without visible structural change, produced in an organ by a shock, as by fall or blow; as, a concussion of the brain.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.