What is truth

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I had to write a paper of existentialism for my philosophy class. My teacher gave it back with an F. She’d underlined true and truth wherever it appeared in the essay, probably about twenty times, with a question mark beside each. She wanted to know what I meant by truth. What is this bullshit? How am I supposed to define words? Using other words? Then I'd have to define those words also. Which results in an infinite regress.