English Reference

Word

arcane

Phoneticsar·cane

US/ˌɑɹˈkeɪn/

UK/ɑːkˈeɪn/

Definition

adj. difficult to understand or know because it is very old, secret, or complex. You use this to describe things that feel like a mystery to most people.

adj. difficult to understand or know; relating to something secret, mysterious, or highly specialized. Often used to describe obscure knowledge or ancient traditions.

Examples

“The old library contains many arcane texts.”

“The software's arcane coding made it nearly impossible for the new team to update the system.”

“The scholar spent years deciphering the arcane symbols found on the temple walls, hoping to unlock the secrets of the lost civilization.”

Examples

simple

“The old library contains many arcane texts.”

contextual

“The software's arcane coding made it nearly impossible for the new team to update the system.”

complex

“The scholar spent years deciphering the arcane symbols found on the temple walls, hoping to unlock the secrets of the lost civilization.”

Real-World Examples

“How serious can a breach of arcane financial regulations be, really?”
The Guardian · 29 Sept 2026
“Ex-BBC Introducing presenter Tom Robinson said that while “the beauty of BBC introducing was that you needed no inside access”, it could still occasionally be an “arcane” process.”
The Guardian · 28 Aug 2026

Etymology

Borrowed from Latin arcānus (“hidden, secret”), from arceō (“to shut up, enclose”); cognate with Latin arca (“a chest”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry

Level
C1 · Advanced
Frequency
Occasional
Updated

Scan code

englishreference.com/q/arcane

English Reference