luminosity function

/L UW0 M IH0 N OW1 S IH0 T IY0 F AH0 NG K SH AH0 N/
noun
  1. 1

    (physics) A standard measure of the response of the human eye to light of different wavelengths

  2. 2

    (astronomy) A relative measure of the relationship between stellar magnitude and the distribution of stars between magnitudes