Definition of peakedness in US English:

peakedness

noun

  • 1The quality or condition of having or terminating in a peak or point. Now rare.

  • 2Statistics. The extent to which distribution, as expressed in a graph, is concentrated in a peak or series of peaks.

noun

  • Pinched or sickly appearance; the state of being in poor health.

Origin

Mid 19th century; earliest use found in John P. Kennedy (1795–1870), novelist and politician. From peaked + -ness<br>late 19th century; earliest use found in Joel Chandler Harris (1848–1908). From peaked + -ness.