तन्त्र
Tantra designates a body of texts (the Tantras and Āgamas), a system of practice (ritual, mantra, yantra, initiation), and a philosophical orientation (the world as the divine's self-expression — not illusion to be transcended but a vehicle for recognition).
"That thou art" — Mahāvākya from Chāndogya Upaniṣad
त्रिगुणातीत
Triguṇātīta is the state of having transcended the three guṇas — sattva, rajas, and tamas — the constituent qualities of all material nature.
तुरीय
Nāntaḥprajñaṃ na bahiṣprajñaṃ nobhayataḥprajñaṃ na prajñānaghanaṃ na prajñaṃ nāprajñam / adṛṣṭam avyavahāryam agrāhyam alakṣaṇam acintyam avyapadeśyam ekātmapratyayasāraṃ prapañcopaśamaṃ śāntaṃ śivam advaitaṃ caturthaṃ manyante sa ātmā sa vijñeyaḥ — 'Not inward-knowing, not outward-knowing, not both; not a mass of knowing; not knowing; not non-knowing — unseen, beyond transaction, beyond grasping, without characteristics, unthinkable, indescribable; its essence is the certainty of the one self; the cessation of the world of appearances; peaceful, auspicious, non-dual — this is the fourth.