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/wɑn/ · one
noun
  1. The digit or figure 1. The number one is the first positive integer.
  2. The neutral element with respect to multiplication in a ring. In algebra, one is the multiplicative identity.
  3. A one-dollar bill. I exchanged my five-dollar bill for two ones at the store.
verb
  1. To cause to become one; to gather into a single whole; to unite. The two families were united in their love for their children.
adjective
  1. Of a period of time, being particular. One day the prince set forth to kill the dragon that had brought terror to his father's kingdom for centuries.
  2. Being a single, unspecified thing; a; any. My aunt used to say, 'One day is just like the other.'
  3. Sole, only. He is the one man who can help you.
numeral
  1. The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number. In many cultures, a baby turns one year old a year after its birth.
  2. The first positive number in the set of natural numbers. The number one is the smallest positive integer.
  3. The cardinality of the smallest nonempty set. A set with one element has a cardinality of one.

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Did you know? The word 'one' has a unique property in many languages, where it is often the first word a child learns to say, and it is also the last word a person says before they die, as it is a universal concept that transcends language and culture.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 19, 2026