Definitions

1. noun

mysterious or obscure knowledge or practices, especially in magic or alchemy; secrets or mysterious things

“The book was filled with arcane symbols that only a few could decipher.”

2. noun

a secret or mysterious quality

“Her enigmatic smile had an air of the arcane about it.”

3. noun

something that is mysterious or difficult to understand

“The arcane workings of the old clock were lost on everyone.”

4. adjective

mysterious or obscure

“The arcane rituals of the cult were steeped in mystery.”