What does digit mean?
A digit is one of the ten numerals — 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 — that serve as the building blocks of our decimal numbering system. Any written number, no matter how large, is composed of these individual symbols arranged in place-value positions, so the year 2024 contains four digits. In computing and telecommunications, the term extends to other bases, as in 'binary digit,' the source of the familiar abbreviation 'bit.' The word carries a second, older meaning: a finger or toe, a sense still current in anatomy and medicine. This dual meaning is no coincidence — people counted on their fingers long before written numerals existed, so the word for finger came naturally to name the symbols that replaced it. Today 'digit' is most often encountered in technical and numerical contexts, appearing in phrases like 'double-digit inflation' or 'a four-digit code.' It is a neutral, standard word with no strong connotation, essential for anyone discussing numbers precisely, since confusing an individual digit with an entire number can lead to real ambiguity.
Any of the Arabic numerals 0 through 9, especially as one component of a larger written number.
"Add up all the digits in your account number and note whether the total is even."
In mathematics and computing, extended senses exist, such as 'binary digit' (bit).
A finger or a toe of a human being or other primate.
"The X-ray revealed a fracture in the third digit of her left hand."
This sense is chiefly found in medical, zoological, and formal contexts.
The plural is regular. 'Digits' commonly refers collectively to the characters making up a number, as in 'the last four digits of your card.'
"Please confirm the last two digits of your order number."
Every photo you've ever taken, every song you've streamed, exists because 'digit' once meant nothing more than a finger — the original counting tool humans were born with.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of digit
'Digit' comes from Latin 'digitus,' meaning 'finger' or 'toe.' The word entered English via French in the late Middle Ages, initially retaining its anatomical sense before acquiring the numerical meaning. Because counting on fingers was among humanity's oldest calculating methods, the Latin term came to denote the numerals themselves — a semantic shift already visible in medieval mathematical writing. Cognates and derivatives sharing the same root include 'digital,' 'digitize,' and the rarer 'digitigrade' (an animal that walks on its toes).
Related word forms
How digit is actually used
In everyday use, 'digit' almost always refers to the numerals 0–9; the anatomical sense (finger or toe) appears mainly in medical or scientific contexts. In mathematics and computing, terms like 'binary digit' (bit) extend the sense beyond base-10 numerals.
Easily confused with digit
A digit is a single numeral from 0 to 9 used to write numbers, whereas an integer is any whole number, which may be written using many digits.