/əˈkɒmplɪs/
[noun] A person who helps someone else commit a crime or do something wrong, even if they do not take the main part in it.
The word 'accomplice' was born from a spelling mistake — a misread 'a' turned a helper into a criminal partner forever.
The story of 'accomplice' begins in Latin, with the word 'complex', meaning someone who is folded or twisted together with another. This came from 'com-' (together) and 'plectere' (to weave or braid). The idea was vivid: two people so entangled with each other that you could not easily separate them. From this root, Latin built 'complex' into a word describing a partner or associate, someone whose fate was literally woven into yours.
This Latin root passed into Old French as 'complice', meaning a partner in crime or a close associate. Old French 'complice' carried the same tight sense of entanglement — two people bound together by shared action, shared guilt, or shared purpose. It was a clean, efficient word that English borrowed directly in the 15th century, appearing in legal documents and moral texts as a term for someone who participated in wrongdoing alongside another.
Here is where things get wonderfully strange. At some point in the 15th and 16th centuries, English writers began writing 'an complice' — and through a process linguists call 'false splitting', that 'n' broke off and attached itself to the word. 'An complice' became 'a nomplice' and then gradually 'accomplice'. The same thing happened to other English words: 'a napron' became 'an apron', and 'a nadder' became 'an adder'. In accomplice's case, the error ran the other direction, adding a letter rather than losing one.
The shift in spelling also subtly changed the word's feel. The original 'complice' sounded almost neutral, like a companion or partner. The new form 'accomplice', with its heavier opening syllable, acquired a darker, more loaded tone over time. By the 17th century it was firmly a legal and moral term — not just any associate, but specifically someone who knowingly aided a criminal act. Courts drew careful distinctions between the main offender and the accomplice, and these distinctions shaped how the word was used in literature and law alike.
The underlying root 'plectere' (to weave) also gave English other words through different paths. Latin 'plectere' produced 'complexus', which traveled through Middle French as 'complexe' before entering English as 'complex'. The same root, via a slightly different Latin branch, gave us 'complicit' and 'complicity' — words that keep the original sense of being woven into something together. So when we call someone an accomplice, we are unknowingly reaching back to an ancient image of two threads braided inseparably together, sharing both the pattern and the blame.