Yajna Purusha

The essence of the sacrifice.

Yajnadeva

The personified, deified (Deva) Yajna. Yajnadeva was the son of Ruci and Akuti.

Ruci is a mind-born son of Brahma, Akuti is the daughter of Swayambhuva Manu.

In some Puranas Yajnadeva is an Avatar of Vishnu.

Yogendras

The nine Yogendras are beings that can move freely in the universe.

Their names are Kavi, Havi, Antariksha, Prabuddha, Pippalayana, Avirhotra, Drumila, Camasa, Karabhajana.

Yajnopavita

The three upper castes receive the holy thread, Janeu (Hindi)/Yajnopavita (Sanskrit) that is considered a second birth, they are then called twice born, dvija. The rite is called Upanayana.

After that a third birth can take place, the initiation (diksha) with a guru, then the person is a trija.

Yugavatara

See Avatars of Vishnu.

Yadu

Yadu was the 7th King of the Yadu Dynasty (vamsa) into which Krishna was born.

Read about Yadu Dynasty here
http://www.yadavhistory.com/origin_of_yadavs

Yal

A plucked instrument from south India, mostly transliterated Yazh.

In North India it is the Vina.

Yugas and Vishnu

The Avatars of Vishnu are partitioned among the Yugas in different variants.

There is the 4 – 3 – 2 – 1 partition

Satya Yuga – Fish, Turtle, Boar, Manlion.
Treta Yuga – Dwarf, Rama with the Ax, Rama
Dvapara Yuga – Krishna, Buddha
Kali Yuga – Kalki

In the Mahabharata is sayed, that with Krishna’s death Kali Yuga began.
After that Buddha should be assgined to Kali Yuga. That contradicts the 4 – 3 – 2 – 1 order.

Yoga Vasishtha

A work attributed to Valmiki, consisting of 6 books with 32.000 couplets. It is a discourse of Vasishtha to Rama. Another name is Vasishtha Ramayana, probably the work is written by Vasishtha.

The original version is Brihat Yoga Vasishtha, the abridget version is Laghu Yoga Vasishtha.

Rama was dejected and close to despair of the world. Vasishtha speaks to him about the nothingness of the phenomenal world, which, according to the philosophy of Advaita Vedanta, is Maya (illusion).

Yuvanashva

King Yuvanashva had no descendants and asked the sages for a fire sacrifice, combined with a request for an heir to the throne, Putrakamyeshti.

At the end of the sacrifice, the holy water was poured into a vessel. It was meant for Yuvanashva’s wife. Yuvanashva accidentally drank from the jar, became pregnant, and gave birth to a son from his right side.

Indra was ready to raise the boy, he said ‚Mam dhata‘ – I will be your carer. The child was therefore called Mandhata.