demonstr. pronoun & adv.

1. he, she, it; this, that (often referring back to someone/something just mentioned); sometimes, for emphasis, connected with a 1st or 2nd person verb or pronoun, or with other demonstr. or relative pronouns: this one; that one; esp. tayidaṃ (tad + idaṃ), this very …; this … here; this very thing.
2. as adjective: that.
3. as correlative to ya(d)
4. repeated, often with indefinite sense: each one; anyone; this and that.

tad²

acc. adv. there, thither; then; thus, in regard to this; therefore.