Definition of over-density in US English:

over-density

noun

  • 1Excessive or undesirable density (especially of population).

  • 2Astronomy. Greater density in a region of space than the average; a region so characterized, especially as favouring star formation.

Origin

Mid 19th century; earliest use found in Journal of the Royal Statistical Society. From over- + density.

Pronunciation

over-density

/ˌəʊvəˈdɛnsɪti/