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O
- Om:
- The sacred syllable discussed in the Māṇḍūkya Upaniṣad and the Yoga Sūtras. The first instruction (ādiśāsana). See Śabdasrotas.
- Om Japa:
- The repetition of “om.” From which comes the destruction of obstacles (abhāva of antarayas) and the attainment of inner consciousness (adhigama of pratyakcetana).
- One-Dimensional Space:
- See Triguṇa Brahman.
- Ontology:
- The study of the nature of existence or being. See Darśana.
- Ouroboros:
- The mythical snake that swallows its tail. See Kālacakra.