What is the meaning of ти?

You, thou; the second-person singular pronoun in the nominative case, used as the subject of a verb.

Short form of the second-person singular pronoun in the dative case, used as the indirect object of a verb; to you, for you, you.

Short form of the second-person singular possessive pronoun; your.

you

you, thou (second-person singular pronoun)

Used with reflexive verbs.

The alternative forms with an initial н- (n-) in the third person are used after a preposition.

The plural forms with an initial и- (i-) are unstressed.

The forms with an initial й- (j-) or ї- (ji-) in the third person non-feminine dative/accusative cases are used at the beginning of the sentence and when they are stressed.

The instrumental and locative cases are never used without a preposition.

T, t (Latin letter)

you sg

you (singular); thou

Source: wiktionary.org