arcane
UK: ɑːˈkeɪn | US: ɑːrˈkeɪn
adj. mysterious, secret, or understood by only a few
The word "arcane" traces back to the Latin arcanus, meaning "secret" or "hidden," derived from arca (a chest or box, metaphorically implying concealment). The suffix "-ane" is an adjectival formant, often used in English to denote qualities. Over time, "arcane" evolved to describe knowledge or practices deliberately kept obscure, such as esoteric traditions or specialized fields. The imagery of a locked chest (arca) persists in its modern sense of guarded or enigmatic wisdom.
The ancient manuscript contained arcane symbols no one could decipher.
Only the high priest understood the temple’s arcane rituals.
Quantum physics seems arcane to those without advanced training.
She spoke in arcane terms, leaving her audience bewildered.
The wizard guarded his arcane knowledge fiercely.