Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. A human finger or toe.
 n. A corresponding part in other vertebrates.
 n. A unit of length derived from the breadth of a finger and equal to about 3/4 of an inch (2.0 centimeters).
 n. One of the ten Arabic number symbols, 0 through 9.
 n. Such a symbol used in a system of numeration.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A finger or toe.
 n. A numeral that can be combined with others to write larger numbers, and that cannot itself be split into other numerals.
 n. One's phone number.
 v. To point at or point out with the finger.
from the GNU version of the Collaborative International Dictionary of English
 n. One of the terminal divisions of a limb appendage; a finger or toe.
 n. A finger's breadth, commonly estimated to be three fourths of an inch.
 n. One of the ten figures or symbols, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, by which all numbers are expressed;  so called because of the use of the fingers in counting and computing.
 n. One twelfth part of the diameter of the sun or moon;  a term used to express the quantity of an eclipse.
 transitive v. To point at or out with the finger.
from The Century Dictionary and Cyclopedia
 n. A finger or toe; in the plural, the third segment of the hand (manus) or foot (pes), consisting of the fingers or toes, each of which has usually three, sometimes two, occasionally one, and rarely more than three, joints or phalanges.
 n. A fingerbreadth; a dactyl; one fourth of a palm: a measure of length. The Roman digit was 18.5 millimeters or 0.73 of an English inch. See dactyl and fingerbreadth.
 n. In astronomy, the twelfth part of the diameter of the sun or moon: used in expressing the quantity of an eclipse: as, an eclipse of six digits (one which hides one half of the diameter).
 n. One of the first nine numbers, indicated by the fingers in counting on them; also, one of the nine Arabic numerals, 1, 2, 3, 4, 5, 6, 7, 8, 9.
 To point at or out with the finger.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. one of the elements that collectively form a system of numeration
 n. a finger or toe in human beings or corresponding body part in other vertebrates
 n. the length of breadth of a finger used as a linear measure
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

The remaining digit is known as the “check digit,” which is used to help determine whether or not the overall number is legitimate.
What The Numbers On Your Credit Card Mean  Lifehacker Australia

Now we have to go up considerably in scale, and there aren't any squares ending in more than five repeated 4's, as the sixth last digit is always odd (1's and 9's, however, continue) 2088941230489 (1445317 squared) in base 10 is 1E65E999999 in hex

ID guy insists that Shannon Information doesn't deal in fractional bits, even when it was pointed out that Shannon said "a decimal digit is about 3 1/3 bits."

Double digit or single digit is absolutely immaterial in this primary election.
Final returns in Pennsylvania: did Clinton nab a doubledigit win?

Clearly, we should all understand the math ..... she won by 9.3 pts. and to call that doubledigit is wrong.

For CNN to continue to refer to it as a double digit is completely and utterly misleading, mathematically incorrect, and gives Clinto credit where no credit is due.

The first digit is the number you started with, the last two are your age. the final bit states that this is the only year this will work, so pass it on.

Such an impressively low digit is coveted by just about everybody ...

When the person draws the line, the leftmost digit is drawn to the top or left, which is like moving "C over by 1".

A mathematical theory called "Benford's Law" predicts that in a set of numbers, numbers whose first digit is "1" will turn up more frequently than numbers that start with other digits.
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