|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
stagnation stag·na·tion (stāg-nā'shən)
The retardation or cessation of the flow of blood in the blood vessels, as in passive congestion.
The accumulation of a normally circulating fluid in a part or an organ.