What does triplicate mean?
Triplicate is a formal word relating to three identical copies or a threefold amount. It can be used as an adjective, as in “triplicate keys,” meaning keys made in three identical sets; as a noun, meaning one of three matching copies or the whole set; and as a verb, meaning to make three copies of something. Its most familiar expression is “in triplicate,” used for contracts, forms, certificates, and other official documents that must be prepared three times. In general use, “triple” or “threefold” will often sound more natural, particularly when describing a quantity rather than physical copies. Triplicate is especially associated with legal, institutional, and administrative language, where precision matters and duplicate originals may be distributed to different parties. Its Latin roots, meaning “three” and “to fold,” also explain why the word carries the idea of something being produced in three matching layers.
Threefold, or consisting of three identical copies.
"The office issued triplicate keys to each member of staff."
This use is formal and especially common in administrative, legal, and institutional contexts.
One of three identical copies; also, a complete set of three such copies.
"She completed the application in triplicate."
The phrase “in triplicate” is the standard expression for supplying or preparing three identical copies.
To make three identical copies of something.
"The office will triplicate the document before sending it to all three departments."
This is a formal usage found especially in administrative and legal settings.
The plural is used when referring to the separate copies or sets of three.
"The clerk kept one copy and sent the other two triplicates to the relevant offices."
From the Latin roots for “three” and “fold,” triplicate literally means “folded three times” and ultimately evokes the number three itself.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does triplicate come from?
The word comes from Latin, combining the prefix tri- (“three”) with forms based on plicare (“to fold”), a development reflected in the related Latin participle triplicatus. English borrowed the word in the early 17th century for the production of three identical copies, and its modern meanings retain that association with triplication. Its relatives triple, triplicity, and triplication share the same underlying numerical and folding roots.
Related word forms
How triplicate is actually used
The phrase “in triplicate” is standard in formal and administrative contexts, especially when a document must be prepared as three identical copies. As an adjective, “triplicate” is less common than “triple” or “threefold,” while the noun is especially associated with legal and official paperwork.
Easily confused with triplicate
A duplicate is any additional copy, whereas a triplicate is specifically one of three identical copies or something made threefold.