The state of being dim, poorly illuminated, almost dark.(noun)
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Use "dimness" in a sentence
"A thick fog wrapped the world in dimness early this morning; at eight o'clock it was rolling off and piling itself in glorious headlands"
"Some people may find cooking and eating in dimness romantic, but we’d prefer that it be a choice and not a requirement."
"After a while, up came a man and saying, “This is a fox whose gall cleareth away film and dimness from the eyes, if they be anointed therewith like kohl,” took out his knife to slit up the fox’s paunch."