अद्वैतAdvaita
Non-dual. Literally: a (not) + dvaita (two). The central claim of Advaita Vedanta: reality is non-dual, and the appearance of multiplicity is due to māyā.
अहंकारAhaṃkāra
The ego — the sense of being a separate, individual 'I'. The third modification of the inner instrument (antaḥkaraṇa), after mind (manas) and intellect (buddhi). Not the self, but often mistaken for it.
अहं ब्रह्मास्मिAhaṃ Brahmāsmi
I am Brahman. The second Mahāvākya, from Bṛhadāraṇyaka Upaniṣad 1.4.10. The first-person recognition of Brahman-Ātman identity.
अधिकारAdhikāra
Qualification, fitness. The four qualifications for Vedantic inquiry (sādhanacatuṣṭaya): viveka, vairāgya, śamādi ṣaṭkasampatti, mumukṣutva.
अध्यासAdhyāsa
Superimposition — the cognitive error of attributing the properties of one thing to another. Śaṅkara's foundational concept: the mutual superimposition of self and not-self is the root of bondage.
अविद्याAvidyā
Ignorance — specifically, the ignorance of Brahman-Ātman identity. Not mere lack of information but the deep-seated misidentification of the self with the not-self. Root cause of saṃsāra.
आत्मन्Ātman
The self. Not the ego or personality but the pure witnessing awareness present through all states of consciousness. Identical with Brahman in Advaita.
आनन्दĀnanda
Bliss, fullness. One of the three intrinsic indicators of Brahman (Sat-Cit-Ānanda). Not happiness dependent on conditions but the fullness of what lacks nothing.
अन्तर्यामिन्Antaryāmin
The inner controller. Brahman as the consciousness that pervades and animates all beings from within, described in Bṛhadāraṇyaka Upaniṣad 3.7.
अमात्रAmātra
Without measure. The fourth part of Oṃ — the silence after M — corresponding to Turīya. Not a phoneme but the ground of all phonemes.