What does complicacy mean?
Complicacy is a formal noun denoting the state of being complicated — that is, made up of interconnected parts or elements that render something difficult to understand, analyse, or resolve. It can also refer to an individual complicating feature, so one might speak of 'a complicacy in the contract' just as one might cite a specific complication. The word entered English in the early seventeenth century, formed from the Latin verb complicare, meaning 'to fold together', the same root that gives us 'complicate', 'explicate', and 'ply'. Although complicacy was once a common alternative to 'complexity', it has gradually receded into more specialised usage and today appears chiefly in legal documents, scholarly prose, and technical writing, particularly in British English. Writers who reach for it usually want a slightly more formal or old-fashioned tone than 'complexity' provides. Its plural, complicacies, tends to denote discrete complicating factors rather than abstract levels of intricacy, making the word useful when enumerating the individual snags within an otherwise tangled situation.
nounThe state or quality of being complicated or intricate; a complicated feature or element.
- The state or condition of being complicated or difficult to understand or deal with.
- A single factor or element that contributes to something's being complicated.
"The complicacy of the tax code makes professional advice almost indispensable."
"The complicacy of the negotiations surprised even the seasoned diplomats."
"Each new complicacy added weeks to the project's timeline."
The plural typically refers to multiple distinct complicating factors or features rather than varying degrees of difficulty.
"The auditor catalogued the various complicacies buried in the company's accounts."
Once a serious rival to 'complexity', 'complicacy' now survives mostly in legal and technical prose — a linguistic fossil you can still put to work.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of complicacy
Complicacy derives from the Latin verb complicare, composed of com- ('together') and plicare ('to fold'), literally meaning 'to fold together'. It passed into English in the early seventeenth century, likely via post-classical Latin complicacia or by direct formation on 'complicate'. It shares this folding root with a wide family of English words, including 'pliable', 'deploy', and 'exploit', all ultimately tracing back to the notion of bending or weaving things together.
How complicacy is actually used
Formal register, now relatively rare compared with 'complexity'; most often found in British legal, academic, and technical writing. Plural use ('complicacies') typically refers to individual complicating factors rather than degrees of difficulty.
Easily confused with complicacy
'Complicacy' is a rarer synonym for the state of being complicated, whereas 'complexity' is the standard modern term for intricate structure or difficulty.