a member of a group of people or things: One of their daughters has just had a baby. EMI is one of the world's largest recordpanies. Finding a cure for cancer is one of the biggest eX7DoZ8ajBW0 one 2 of 4 noun 1 : the first whole number above zero see Table of Numbers 2 : the number denoting unity 3 a : the first in a set or series often used with an attributive noun day one b : an eoS3czAowS5o adjective. 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. being a person, thing, or individual instance or member of a number, kind, group, or category indicated: one member of the party. HRhABjmVFaX0 Webadjective. 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. being a person, thing, or individual instance or member of a number, kind, 3YIofPVjz8sM
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