noun
esoterica; mystery; sanctum
Refers to hidden, profound, or sacred teachings, often in religious, philosophical, or occult contexts. Not an everyday word; carries a literary or specialized tone.
その古文書には宗派の秘義が記されている。
The ancient manuscript records the esoteric teachings of the sect.
彼は長年の修行の末に、ついに秘義を悟った。
After years of training, he finally grasped the profound mystery.
Compound of 秘 (hi, 'secret') and 義 (gi, 'meaning' or 'principle'). The exact historical derivation is uncertain, but the spelling is conventionally associated with hidden or esoteric teachings.