Definition of: that

(that, unstressed thət) adjective plural those
1. Pertaining to some person or thing previously mentioned, understood, or specifically designated: that man.
2. Denoting something more remote in place, time, or thought: correlative to this.
—pron.
1. As a demonstrative, the person or thing implied, mentioned, or understood; or the person or thing there or in the second place: That is the dress I like.
2. As a relative, who or which: used as a correlative to such or so. ♦ In earlier English, that was the relative pronoun, who, what, and which being only interrogatives until they gradually assumed the force of relatives, and in some uses superseded that. When the relative clause qualifies or makes an addition to the main clause, who or which is generally preferred, whereas that usually introduces a restrictive clause. Thus we say: Washington, who was the first president, is often called Father of his Country. But: The Washington that emigrated to this country was his ancestor.
—adverb
1. Colloq. In such a manner or degree; so.
2. To that extent: I can't see that far.
—conj. That is used primarily to connect a subordinate clause with its principal clause, with the following meanings:
1. As a fact that: introducing a fact: I tell you that it is so.
2. So that; in order that: I tell you that you may know.
3. For the reason that; seeing that; because: She wept that she was growing old.
4. As a result: introducing a result, consequence, or effect: He bled so profusely that he died.
5. At which time; when: It was only yesterday that I saw him.
6. Introducing an exclamation: O that he would come! See synonyms under BUT.
—so that
1. To the end that.
2. With the result that.
3. Provided. See THOSE. [OE thæt, neut. of se the]