A really fast thesaurus... with lots of synonyms.

(n) :
the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set; the ordinality of an element which has no predecessor, usually called first or number one

"there is only one Earth."

(adj) :
of a period of time, being particular; as, one morning, one year; a single, unspecified thing; a; any

"one day the prince set forth to kill the dragon that had brought terror to his father's kingdom for centuries."

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(n) :
the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set; the ordinality of an element which has no predecessor, usually called first or number one

"there is only one Earth."

(adj) :
of a period of time, being particular; as, one morning, one year; a single, unspecified thing; a; any

"one day the prince set forth to kill the dragon that had brought terror to his father's kingdom for centuries."