digit

Short definition from Wiktionary

Noun

1. 1
   A position in a sequence of numerals representing a place value in a positional number system.
2. 2
   A distinct symbol representing a natural number in a positional number system.
3. 3
   ¹⁄₁₂ the apparent diameter of the sun or moon, (chiefly) as a measure of the totality of an eclipse.
4. 4
   A unit of length notionally based upon the width of an adult human finger, standardized differently in various places and times, (especially) the English digit of ¹⁄₁₆ foot, now equivalent to about 1.9 cm.
5. 5
   Synonym of inch.
6. 6
   A narrow extremity of the human hand or foot: a finger, thumb, or toe.
7. 7
   Similar or similar-looking structures in other animals.
8. 8
   Synonym of degree: ¹⁄₃₆₀ of a circle.
9. 9
   Synonym of manicule.

Verb

1. 1
   To point at or point out with the finger.