ॐ

A ligature of the letters अ and उ, with the diacritic ँ.

ॐ

1. om or aum: the sacred syllable and mantra in Hinduism, Buddhism, Jainism and Sikhism

• (Rarh) IPA^(key): /om/, [ˈoːm], [ˈom], /õm/, [ˈõm], /oũm/, [ˈoũm]

• (Dhaka) IPA^(key): /om/, [ˈoːm], [ˈom], /õm/, [ˈõm], /om/, [ˈom], /ou̯m/, [ˈou̯m]

ॐ • (om̐)

1. alternative spelling of ওঁ (ō̃)

• ओम् (om)

From Sanskrit ॐ (oṃ)

• (Delhi) IPA^(key): /oːm/, [õːm]

ॐ • (om) (Urdu spelling اوم)

1. the sacred syllable and mantra in Hinduism, Buddhism, Jainism and Sikhism

ॐ • (om) m (Urdu spelling اوم)

1. om; aum

• ओम् (om)

Borrowed from Sanskrit ॐ (oṃ). First attested as Old Marathi ॐ (oṃ).

• IPA^(key): /om/

ॐ • (om)

1. the sacred syllable and mantra in Hinduism, Buddhism, Jainism and Sikhism

ॐ • (om) m

1. om; aum

• ओम् (óm)

Etymology disputed.

• A. Parpola proposes borrowing from Dravidian, ultimately from Proto-Dravidian *ām (“let it be so, it is so, yes”), a contraction of *ākum, cognate with Tamil ஆம் (ām, “yes”).
• M. Blumfield proposes derivation from Proto-Indo-European *au (introductory particle) via *ō >* ōṃ > ōm, cognate with Ancient Greek αὖ (aû).
• The Upaniṣads propose multiple Sanskrit etymologies, including: from आम् (ām, “yes”); from एवम् (evam, “that, thus, yes”); and from आप् (āp, “to attain”) or अव् (av, “to urge”).

• (Vedic) IPA^(key): /ɐ́wm/
• (Classical Sanskrit) IPA^(key): /oːm/

ॐ • (óṃ)

1. the sacred syllable and mantra in Hinduism, Buddhism, Jainism and Sikhism: om, aum

• Monier Williams (1899) “ओम्”, in A Sanskrit–English Dictionary, […], new edition, Oxford: At the Clarendon Press, →OCLC, page 235, column 3.
• Mayrhofer, Manfred (1992) “óm”, in Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎^[1] (in German), volume 1, Heidelberg: Carl Winter Universitätsverlag, pages 280-281