a finger or toe.
the breadth of a finger used as a unit of linear measure, usually equal to 3/4 inch (2 cm).
any of the Arabic figures of 1 through 9 and 0.
any of the symbols of other number systems, as 0 or 1 in the binary.
index ( def 6 ).
Astronomy. the twelfth part of the sun's or moon's diameter: used to express the magnitude of an eclipse.

1350–1400; Middle English < Latin digitus finger, toe

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World English Dictionary
digit (ˈdɪdʒɪt)
1.  a finger or toe
2.  Also called: figure any of the ten Arabic numerals from 0 to 9
3.  another name for finger
4.  astronomy one twelfth of the diameter of the sun or moon, used to express the magnitude of an eclipse
[C15: from Latin digitus toe, finger]

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

late 14c., from L. digitus "finger or toe," related to dicere "tell, say, point out" (see diction). Numerical sense is because numerals under ten were counted on fingers.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

digit dig·it (dĭj'ĭt)
A finger or toe; dactyl.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
digit   (dĭj'ĭt)  Pronunciation Key 
  1. Anatomy A jointed body part at the end of the limbs of many vertebrates. The limbs of primates end in five digits, while the limbs of horses end in a single digit that terminates in a hoof. The fingers and toes are digits in humans.

  2. Mathematics One of the ten Arabic numerals, 0 through 9.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

digit definition

An employee of Digital Equipment Corporation. See also VAX, VMS, PDP-10, TOPS-10, DEChead, double DECkers, field circus.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica


in anatomy, finger or toe of land vertebrates, the skeleton of which consists of small bones called phalanges. The tips of the digits are usually protected by keratinous structures, such as claws, nails, or hoofs, which may also be used for defense or manipulation. Digits are numbered one through five, beginning with the inside digit (thumb) when the palm (paw) is face downward

Learn more about digit with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Each bird, therefore, has a nine-digit number on its band-room for endless
When dialing from a local phone, use the area code and seven-digit phone number.
First, an earthquake is summarized by an easy-to-remember and easy-to-interpret
  single-digit number.
Please note that the inmate's committed name and eight-digit register number
  must be entered correctly.
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