that

/ˈt͟hat/

Middle English, from Old English thæt, neuter demonstrative pronoun & definite article; akin to Old High German daz, neuter demonstrative pronoun & definite article, Greek to, Latin istud, neuter demonstrative pronoun

pronoun

  1. the person, thing, or idea indicated, mentioned, or understood from the situation

  2. the time, action, or event specified

  3. the kind or thing specified as follows

that is my father

after that I went to bed

conjunction

  1. —used as a function word to introduce a noun clause that is usually the subject or object of a verb or a predicate nominative

  2. —used as a function word to introduce a subordinate clause that is anticipated by the expletive it occurring as subject of the verb

  3. —used as a function word to introduce a subordinate clause that is joined as complement to a noun or adjective

adjective

  1. being the person, thing, or idea specified, mentioned, or understood

  2. being the one specified —usually used for emphasis

  3. so great a : such