What is the meaning of ты?

you (singular)

Synonym of седе (sede)

emphatic particle

you (singular), thou

second-person singular, nominative case: you, thou

Archaic feminine form: оне́ (oné).

The letter г (g) in the genitive/accusative case ending is pronounced as /v/.

The alternative forms starting with н- (n-) are used after a preposition.

Archaic forms: ея́ (jejá), нея́ (nejá).

Instrumental forms ending in -ю (-ju) are either dated, poetic, or dialectal.

The prepositional case is never used without a preposition.

Letter г (g) in the genitive/accusative case ending is pronounced as /v/.

The alternative forms starting with н- (n-) are used after a preposition.

Archaic forms: ея́ (jejá), нея́ (nejá).

Instrumental forms ending in -ю (-ju) are either dated, poetic, or dialectal.

The prepositional case is never used without a preposition.

Source: wiktionary.org

See also