This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state of being dim, poorly illuminated, almost dark.

n. The state or quality � being dim; lack of brightness, clearness, or distinctness; dullness; obscurity.

n. Dullness, or want of clearness, of vision or of intellectual perception.

n. The state of being dim or obscure; want of clearness, brightness, or distinctness; dullness; vagueness: applied either to the object or to the medium of vision or perception: as, the dimness of a view, of color, or of gold; the dimness of twilight or of the sky; dimness of vision, of understanding, memory, etc.

n. Synonyms Obscurity, Gloom, etc. See darkness.

n. the property of lights or sounds that lack brilliance or are reduced in intensity

n. the quality of being dim or lacking contrast

n. the state of being poorly illuminated

"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"

brightness   

dullness    fogginess    blurriness    indistinctness    softness    fuzziness    semidarkness   

dim   

obscurity    gloom    darkness    dullness    dark   

half-light    gloom    stillness    twilight    blackness    murk    haze    grayness    obscurity    confine