What does alias mean?
An alias is a false or alternative name that a person assumes, most often to conceal their true identity. The word is strongly associated with spies, fugitives, and criminals who operate under assumed names, giving it a connotation of secrecy or deception in ordinary usage. In formal contexts such as law and computing, however, it is neutral: legal records may list a person's aliases alongside their real name, and in computing an alias is simply an alternative label or shortcut that refers to the same file, command, or entity. The word can also function adverbially, as in the traditional formula 'John Smith, alias James Brown', meaning 'otherwise called'. Derived from the Latin 'alius', meaning 'other' or 'another', alias entered English in the sixteenth century and shares its root with words such as 'alibi' and 'alien'. Its enduring usefulness lies in capturing the idea of one person or thing standing in under another name.
A false or alternative name by which a person is known, especially one adopted to conceal their identity.
"The detective discovered the suspect had been living under an alias for years."
Often used in legal and police contexts to record names other than a person's legal name.
'Otherwise called': introducing an alternative name for the same person, as in 'John Smith, alias James Brown'.
"The deed was signed by William Hart, alias William Hardy."
The standard plural follows the regular -es pattern.
"The database listed four known aliases for the fraudster."
The word 'alias' comes straight from Latin alius — 'other' — making it literally a word about being someone else.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of alias
Alias derives from the Latin adverb 'alius', meaning 'other' or 'another', entering English in the mid-sixteenth century, where it was first used in legal contexts to indicate an additional or assumed name. It shares this Latin root with cognates such as 'alibi' ('elsewhere') and 'alien', all stemming from the same Proto-Indo-European source. Over time its use broadened from legal records into general usage, and later into computing, where it denotes an alternative reference to the same object.
How alias is actually used
As a noun, 'alias' carries a connotation of deception or criminality in everyday use, though it is neutral in computing contexts. It also functions as an adverb ('otherwise called') and appears in computing as a term for an alternative label or shortcut referring to something else.
Easily confused with alias
A pseudonym is a deliberately adopted alternate name (often for writers or performers), while an alias typically implies concealment of one's true identity.
An alibi is a claim of being elsewhere when a crime occurred; 'alias' refers to a false or alternate name — both derive from Latin 'alius' (other) but mean entirely different things.