adjective, dimmer, dimmest.
not bright; obscure from lack of light or emitted light: a dim room; a dim flashlight.
not seen clearly or in detail; indistinct: a dim object in the distance.
not clear to the mind; vague: a dim idea.
not brilliant; dull in luster: a dim color.
not clear or distinct to the senses; faint: a dim sound.
not seeing clearly: eyes dim with tears.
tending to be unfavorable; not likely to happen, succeed, be favorable, etc.: a dim chance of winning.
not understanding clearly.
rather stupid; dim-witted.
verb (used with object), dimmed, dimming.
to make dim or dimmer.
to switch (the headlights of a vehicle) from the high to the low beam.
verb (used without object), dimmed, dimming.
to become or grow dim or dimmer.
Verb phrases
dim out, (in wartime) to reduce the night illumination of (a city, ship, etc.) to make it less visible from the air or sea, as a protection from enemy aircraft or ships.
take a dim view of, to regard with disapproval, skepticism, or dismay: Her mother takes a dim view of her choice of friends.

before 1000; Middle English, Old English dim(me), cognate with Old Frisian dim, Old Norse dimmr

dimly, adverb
dimmable, adjective
dimness, noun
undim, adjective
undimly, adverb
undimmed, adjective

1. See dark. 3. unclear, faint, indefinite, indistinct, fuzzy, hazy. 10. darken, cloud. 12. dull, fade.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dim (dɪm)
adj , dimmer, dimmest
1.  badly illuminated: a dim room
2.  not clearly seen; indistinct; faint: a dim shape
3.  having weak or indistinct vision: eyes dim with tears
4.  lacking in understanding; mentally dull
5.  not clear in the mind; obscure: a dim memory
6.  lacking in brilliance, brightness, or lustre: a dim colour
7.  tending to be unfavourable; gloomy or disapproving (esp in the phrase take a dim view)
vb , dimmer, dimmest, dims, dimming, dimmed
8.  to become or cause to become dim
9.  (tr) to cause to seem less bright, as by comparison
10.  (US), (Canadian) (tr) Also called (in Britain and certain other countries): dip to switch (car headlights) from the main to the lower beam
[Old English dimm; related to Old Norse dimmr gloomy, dark]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. dimm "dark, gloomy, obscure," from P.Gmc. *dimbaz. Not known outside Germanic. Slang sense of "stupid" is from 1892. The verb was also in O.E. Related: Dimly; dimmed.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dim. abbr.
Latin dimidius (half)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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