What does quadruplicate mean?
Quadruplicate describes something with four equal parts or four matching copies, and as a verb it means to multiply a quantity by four or produce four copies of something. Its best-known use is the formal phrase “in quadruplicate,” in which a document is supplied in four identical instances. The adjective conveys an exact fourfold proportion rather than a vague repetition, while the noun denotes one member of a set of four identical counterparts, especially a legal or administrative document. In general prose, “four copies” or “four times as many” is usually clearer, but quadruplicate remains useful in legal, bureaucratic, and technical contexts where the precise fourfold form matters. As a verb, it can also mean to increase a number to four times its original value, although “quadruple” is often the more idiomatic choice for that operation.
Consisting of four equal parts or identical copies; fourfold.
"A quadruplicate copy of the signed agreement was placed on file."
Particularly common in legal and administrative contexts, including the phrase “in quadruplicate.”
To make four identical copies of something or to multiply a quantity by four.
"The office quadruplicated the application forms before distribution."
When functioning as a verb, the word is commonly pronounced with final /eɪt/.
One of four identical copies or counterparts, especially a document issued or retained in fourfold form.
"Each tenant received a quadruplicate of the lease agreement."
This noun use is uncommon outside legal, clerical, and administrative contexts.
The plural refers collectively to four or more corresponding copies, especially copies of a document.
"The four quadruplicates were signed before distribution."
From Latin for “fourfold,” quadruplicate means not merely repeated, but multiplied to four.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does quadruplicate come from?
Quadruplicate comes from Latin quadrūplicātus, meaning “fourfold” or “made fourfold.” It combines quadrū-, meaning “four,” with plicātus, a past participle of plicāre, meaning “to fold.” Related forms such as quadruple and quadruped belong to the same Latin numerical family.
Related word forms
How quadruplicate is actually used
The word is especially common in formal, legal, and administrative writing, particularly in the expression “in quadruplicate.” It is more specific than “duplicate,” which does not indicate the number of copies. Its final syllable is commonly pronounced /eɪt/ when the word functions as a verb.
Easily confused with quadruplicate
A duplicate is any copy, whereas a quadruplicate is one of four matching copies or is explicitly multiplied by four.
Quadruple generally means four times as much or to multiply by four, while quadruplicate more specifically suggests four equal parts, four matching instances, or the practice of producing four copies.