pronoun pl. those

1. the person or thing mentioned or understood that is John; that tastes good the thing farther away than another referred to as “this” this is larger than that the more remote in thought of two contrasted things of the two possibilities, this is more likely than that certain people those who know
2. who, whom, or which the road (that) we took where; at which; on which the place that I saw her when; in which; on which the year that I was born

Etymology: ME < OE thæt, nom. & acc. neut. of the def. article (nom. masc. se, nom. fem. seo), akin to Ger neut. nom. & acc. das < IE demonstrative base *-to-, *-tā- > there, thither, L istud, that, talis, such

adjective pl. those

1. designating the person or thing mentioned or understood that woman is Mary; that pie tastes good
2. designating the thing farther away than the one referred to as “this” this house is larger than that one
3. designating the more remote in thought of two contrasted things of the two, this possibility is more likely than that one
4. designating something or someone not described but well known or easily recognizable: sometimes with implications of disparagement that certain feeling, there comes that smile!, that George!

conjunction

adverb

1. to that extent; so [I can't see that far ahead]: also used informally before an adjective modified by a clause of result [I'm that tired I could drop]
2. ☆ Informal very; so very: used in negative constructions I didn't like the book that much