One
Definition
(pro) : Used instead of a noun to avoid repeating the same word.
Example
"(n) : One is her favourite number."
"(adj) : One small mistake can change the result, so it is important to stay careful and focused."
"(pro) : She is the one who helped everyone during the difficult time without expecting anything in return."
Explanation
One is the number that comes before two and after zero. It is used to talk about a single person, thing, or idea. People also use one to mean someone or any person when the exact person is not important. For example, “One should always be honest” means any person should be honest. People also use one instead of repeating a word that has already been mentioned. For example, in the sentence “He doesn’t like the red shirt; he prefers the blue one”, the word one means shirt. This helps the sentence sound shorter, clearer, and less repetitive. The word can show unity, being alone, or being first.