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"its luminosity is measured relative to that of our sun"nounthe quality of being luminous; emitting or reflecting light
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curiosity generosity velocity atrocity monstrosity animosity sensuous ferocity reciprocity precocity viscosity luminosity grandiosity impetuosity pomposity porosity religiosity strenuosity tuberosity jocosity preciosity numerosity sinuosity angulosity callosity pseudo generosity morbid curiosity bellicosity voluminosity platitudinous ponderosity