![]() ![]() Words that derive their meaning from one include alone, which signifies all one in the sense of being by oneself, none meaning not one, once denoting one time, and atone meaning to become at one with the someone. One is also a gender-neutral pronoun used to refer to an unspecified person or to people in general as in one should take care of oneself. ![]() One is commonly used as a determiner for singular countable nouns, as in one day at a time. Linguistically, one is a cardinal number used for counting and expressing the number of items in a collection of things. One originates from the Old English word an, derived from the Germanic root *ainaz, from the Proto-Indo-European root *oi-no- (meaning "one, unique"). It commonly denotes the first, leading, or top thing in a group. The unique mathematical properties of the number have led to its unique uses in other fields, ranging from science to sports. Additionally, 1 is the smallest possible difference between two distinct natural numbers. 1 is by convention not considered a prime number this was not universally accepted until the mid-20th century. In advanced mathematics, a multiplicative identity is often denoted 1, even if it is not a number. Most if not all properties of 1 can be deduced from this. The fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number. It is also sometimes considered the first of the infinite sequence of natural numbers, followed by 2, although by other definitions 1 is the second natural number, following 0. In conventions of sign where zero is considered neither positive nor negative, 1 is the first and smallest positive integer. For example, a line segment of unit length is a line segment of length 1. 1 is also a numerical digit and represents a single unit of counting or measurement. 1 ( one, unit, unity) is a number representing a single or the only entity.
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