Cipher
noun /ˈsaɪfər/ — A code — or a person no one truly notices.
Definition
A secret or disguised way of writing; a coded message; a person of no importance or who passes unnoticed; the arithmetic symbol for zero.
Beyond the definition
Cipher works in two directions: a cipher is a code, but it's also a person who might as well be one — someone so unremarkable or deliberately unnoticed that they pass through rooms without leaving a mark. Both meanings carry the idea of hidden meaning: the code holds meaning others can't read; the invisible person holds a life others don't bother to read.
Origin & history
From Arabic sifr 'zero, empty', from safara 'to be empty'. Entered medieval Latin as cifra, entered English via French. The mathematical sense (zero) and the cryptographic sense developed in parallel in the medieval Islamic world.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
She had spent years as a cipher in the organisation — invaluable, invisible, and finally tired of both.
The message was in cipher: fifteen minutes with the key, and it opened completely.
He treated his employees as ciphers — useful, interchangeable, and fundamentally uninteresting to him.
Synonyms
code, cryptogram, zero, nobody, nonentity
Antonyms
plain text, notable figure, known quantity
Related words
Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Tablet with repeating shapes
An archaeologist examines a tablet with repeated geometric shapes, studying them as a mystery through a magnifying glass.
The geometric shapes are a cipher—a secret way of writing or a coded message. The archaeologist is working to break the code, treating these shapes as a puzzle that hides a deeper meaning from those who don't have the key.
Image credit: Wordspun · AI-generated conceptual illustration