<p><strong>Noun:</strong></p><ul><li>a person, such as a performer or athlete, who enjoys wide recognition, is esteemed for exceptional talent, and is eagerly sought after for their services.</li><li>any very prominent or successful person or thing.</li></ul><p><strong>Adjective:</strong></p><ul><li>being or amounting to a single unit or individual or entire thing, item, or object rather than two or more; a single: one woman; one nation; one piece of cake.</li><li>being a person, thing, or individual instance or member of a number, kind, group, or category indicated: one member of the party.</li><li>existing, acting, or considered as a single unit, entity, or individual.</li><li>of the same or having a single kind, nature, or condition: We are of one resolve. We belong to one team.</li><li>noting some indefinite day or time in the future: You will see him one day.</li><li>a certain (often used in naming a person otherwise unknown or undescribed): One John Smith was chosen.</li><li>being a particular, unique, or only individual, item, or unit: I'm looking for the one adviser I can trust.</li><li>noting some indefinite day or time in the past: We all had dinner together one evening last week.</li><li>of no consequence as to the character, outcome, etc.; the same: It's all one to me whether they go or not.</li></ul><p><strong>Pronoun:</strong></p><ul><li>a person or thing of a number or kind indicated or understood: one of the Elizabethan poets.</li><li>(in certain pronominal combinations) a person unless definitely specified otherwise: every one.</li><li>(with a defining clause or other qualifying words) a person or a personified being or agency: the one I love.</li><li>any person indefinitely; anyone: One's score is never as good as one would desire.</li><li>Chiefly British. (used as a substitute for the pronoun I): Mother had been ailing for many months, and one should have realized it.</li><li>a person of the speaker's kind; such as the speaker's own self: to press one's own claims.</li><li>something or someone of the kind just mentioned: Your teachers this semester seem to be good ones. The portraits are fine ones.</li><li>something available or referred to, especially in the immediate area: The bar is open, so have one on me! Here, take one—they're delicious.</li></ul>