What does hexadecimal mean?
Hexadecimal is a technical term for a number system based on sixteen rather than ten. It uses the familiar digits 0 through 9 together with the letters A through F, with A representing ten and F representing fifteen. The word is especially common in computing, where hexadecimal provides a compact, easily transcribed form of binary data. Because each hexadecimal digit corresponds to four binary digits, machine values can often be expressed with fewer characters and converted reliably without repeated binary-to-decimal arithmetic. Hexadecimal is also standard for describing digital colors: three hexadecimal digits represent the red, green, and blue components, while a leading number indicates the color format. In mathematics, hexadecimal remains a specialized term, but in software development, web design, and electronics it is an everyday working vocabulary. The name combines the Greek-derived element for six with decimal, referring to the six additional symbols used alongside the ten familiar decimal digits.
Relating to or using a number system based on sixteen, with digits 0–9 and A–F.
"The technician checked the device using its hexadecimal address."
Common in computing, electronics, and digital-design contexts.
A number or notation expressed in a system based on sixteen.
"The programmer converted the value from decimal to hexadecimal."
Used mainly in technical contexts, especially when discussing representations of data or colors.
Rare in general use; the adjective is far more common, and hexadecimal numbers are usually referred to individually or collectively without a plural.
"The table compares several decimal values with their corresponding hexadecimals."
Each hexadecimal digit represents exactly four bits, so a byte can be written compactly with just two characters.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hexadecimal come from?
Hexadecimal combines the combining form hexa-, from Greek hexa meaning six, with decimal, derived from Latin decimus, meaning tenth. The name reflects the use of six additional symbols, A through F, alongside the ten familiar decimal digits, creating a system of sixteen symbols. It became established in English as mathematics and computing developed explicit names for number systems based on powers other than ten. Its relatives include hexagon, hexagram, and hexameter, which share the Greek element hexa-, while decimal belongs to the compound's other element.
Related word forms
How hexadecimal is actually used
This is primarily a technical term in computing, mathematics, electronics, and digital design. In everyday publishing, it is most often encountered in web colors, machine-readable identifiers, and low-level data formats.
Easily confused with hexadecimal
In computing, hex is an abbreviation for hexadecimal, but in ordinary language it can also mean a curse or a jinx.