Dao / Tao — The Way; the ultimate, ineffable principle underlying all existence.
De — Virtue; the Dao as manifest in a being.
Wu wei — Effortless action; responsive non-striving aligned with the Dao.
Qi / Ch'i — Vital energy animating all things.
Yin-Yang — Complementary polarities whose interplay constitutes cosmic change.
Xian — Taoist immortal; a realised practitioner.
San Qing — Three Pure Ones — the supreme Taoist triad.