* Numeral: When it refers to the number 1, it's a numeral.
* Example: "There is one apple on the table."
* Indefinite pronoun: When it refers to a single, unspecified thing or person, it's an indefinite pronoun.
* Example: "One should always be respectful of others."
* Adjective: When it modifies a noun, it acts as an adjective.
* Example: "We only have one chance to succeed."
* Determiner: When it precedes a noun, marking it as singular, it functions as a determiner.
* Example: "I need to buy one loaf of bread."
It's important to consider the context to determine the specific word type.