(mathematics) The whole numbers from 0 to 9 and the Arabic numerals representing them, which are combined to represent base-ten numbers.

(mathematics) A distinct symbol representing one of an arithmetic progression of numbers between 0 and the radix.

(units of measure, astronomy) 1⁄12 the apparent diameter of the sun or moon, as a measure of the totality of an eclipse.

(historical units of measure) A unit of length notionally based upon the width of an adult human finger, standardized differently in various places and times, the English digit of 1⁄16 foot, now equivalent to about 1.9 cm.

(anatomy) A narrow extremity of the human hand or foot: a finger, thumb, or toe.

(zoology) Similar or similar-looking structures in other animals.

(transitive) To point at or point out with the finger.