What does delimiter mean?
A delimiter is a character or symbol that marks where one unit of data ends and the next begins. In computing, delimiters are essential to how information is stored and exchanged: a comma in a CSV file separates one field from another, a tab can divide columns of text, and quotation marks may enclose strings within code. Without delimiters, machines would have no reliable way to tell where one item stops and the next starts. The term also has a broader, less common use, referring to anything that marks the limits of an area or activity, much like a boundary marker on a map. Derived from the Latin verb delimitare, meaning 'to fix the limits of', the word entered widespread use with modern computing and remains firmly technical in register. For anyone working with spreadsheets, programming languages, or databases, understanding delimiters is fundamental: they are small, unobtrusive characters whose quiet work underpins nearly all structured data.
nounA character or symbol that marks the boundary between separate pieces of data or sections of text, such as a comma separating fields in a list. More generally, something that marks or fixes the limits of an area or activity.
- A character or symbol marking the boundary between items of data, especially in computing and data processing.
- Something that serves to mark or establish the limits of an area, domain, or activity.
"The CSV file uses a comma as the delimiter between each field."
"The parser splits the string wherever it encounters a semicolon delimiter."
"Rivers often serve as natural delimiters between neighbouring territories."
Regular plural; used when referring to multiple separator characters or boundary markers, e.g. across different file formats or systems.
"Different file formats rely on different delimiters, so always check before importing data."
Every comma in every spreadsheet you've ever opened was a delimiter — quietly doing the work of keeping your data from collapsing into gibberish.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of delimiter
Delimiter derives from the Latin verb delimitare, formed from de- ('off, away') and limitare ('to fix limits'), itself rooted in limes, the Latin word for a boundary or border path. English adopted the related verb 'delimit' in the mid-19th century, largely in diplomatic and geographical contexts for fixing frontiers, and the noun 'delimiter' followed later, gaining its dominant modern sense in 20th-century computing. It shares this Latin root with 'limit', 'limitation', and 'delimitation'.
Related word forms
How delimiter is actually used
Primarily a technical term used in computing, data processing, and linguistics; outside these fields the more general sense is relatively rare. In American English the spelling 'delimiter' is standard, while British usage occasionally shows 'delimeter' as an error rather than a variant. The word carries no emotional connotation and belongs to formal or technical registers.
Easily confused with delimiter
A delimiter is the concrete marker itself, while delimitation is the abstract act or process of setting boundaries.