What does octet mean?
An octet is a set or unit of eight. Its most important technical use is in computing, where it means a group of eight bits and is equivalent to a byte in standard modern digital systems. Because it specifies the number of bits precisely, “octet” can be preferable to “byte” in networking and data-communication contexts, where the distinction between eight-bit units and other byte sizes may matter. Outside computing, an octet can mean any group of eight, especially a group of eight singers or instrumentalists performing together. The word comes ultimately from the Latin octo, meaning “eight,” through French. It is related in origin to words such as octave, octagon, and octuple, all of which reflect the same numerical root.
nounA group or unit consisting of eight elements. In computing, an octet is a unit of eight bits, equivalent to one byte; in music, it may refer to a group of eight singers or instrumentalists.
- A unit of information consisting of eight bits; in computing, it is commonly equivalent to a byte.
- A musical or vocal group consisting of eight performers.
- A group or collection of eight things.
"Each character in the file is encoded as an octet of eight bits."
"The network protocol transmits the message one octet at a time."
"The chamber choir expanded into a full octet for the final performance."
The plural is formed by adding -s; in computing, multiple octets are often discussed as an octet sequence or octet stream.
"The data was split into four separate octets."
An octet packs eight bits into one neat unit—the digital equivalent of a tiny byte-sized bundle.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does octet come from?
Octet entered English from French octet, which was derived from the Latin octo, meaning “eight.” The word has long been used for a group of eight, while its modern computing sense developed alongside the terminology of information measurement. Its cognates and relatives include octave, octagon, octagonal, and octuple, all reflecting the same ancient numerical root.
Related word forms
How octet is actually used
In computing, octet is precise and emphasizes the fixed size of eight bits, although the term byte is more common in general use. In musical contexts, it is especially associated with vocal ensembles; octet and octette both occur, with octet generally preferred in British English.
Easily confused with octet
An octet is a group of eight, whereas an octave is an interval spanning eight notes or a musical range organized by eight notes.
Octet and octette are spelling variants, with octet being the standard form in computing and British English.