Definition of that conjunction from the Oxford Advanced Learner's Dictionary

that

conjunction

/ðət/,

/ðæt/

/ðət/,

/ðæt/

used after some verbs, adjectives and nouns to introduce a new part of the sentence
- She said (that) the story was true.
- It’s possible (that) he has not received the letter.
- He seemed pleased (that) I wanted to continue.
- The fact (that) he’s older than me is not relevant.
In spoken and informal written English that is usually left out after reporting verbs and adjectives. It is less often left out after nouns. see also given that

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so… that… used to express a result
- She was so tired (that) she couldn’t think straight.
In informal English that is often left out.
(literary) used for expressing a hope or a wish
- Oh that I could see him again!

Word OriginOld English thæt, nominative and accusative singular neuter of se ‘the’, of Germanic origin; related to Dutch dat and German das.

See that in the Oxford Advanced American DictionarySee that in the Oxford Learner's Dictionary of Academic English

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