ETYM Old Eng. ther, as. thaer; akin to Dutch daar, German da, Old High Germ. dâr, Swed. and Dan. der, Icel. and Goth. thar, Skr. tarhi then, and Eng. that. Related to That.
(Homonym: their, they're).
1. In or at that place; SYN. at that place, in that location.
2. In that matter; SYN. in that respect, on that point.
3. To or toward that place; away from the speaker; SYN. thither.

1 — used as a function word to introduce a sentence or clause
2 — used as an indefinite substitute for a name

1 — used for emphasis especially after a demonstrative pronoun or a noun modified by a demonstrative adjective
2. Nonstandard — used for emphasis after a demonstrative adjective but before the noun modified
3. Capable of being relied on for support or aid
4. Fully conscious, rational, or aware

1. That place or position
2. That point
3. A location other than here; that place