satori

Short definition from Wiktionary

Noun

1. 1
   A sudden inexpressible feeling of spiritual awakening or enlightenment, the result of meditation and study.
2. 2
   Enlightenment, epiphany.
3. 3
   A mutant gene of Drosophila, a genus of fruit flies, that causes homosexual behaviour in males (specifically, courtship directed to other males).
4. 4
   A yokai (“supernatural monster”) having the form of a mind-reading monkey-like creature said to dwell in the mountains of the historical Japanese provinces of Hida and Mino (present-day Gifu Prefecture).
5. 5
   Alternative form of satori.