Definition

A thing that exists in only a single instance with no duplicates or copies; often used to describe rare items, limited editions, or utterly singular achievements.

Example Usage

That vintage painting is a one of one—there's nothing else like it in the world.

Origin

A colloquial mathematical phrasing that gained popularity in art and collectibles markets in the late 20th century.

Fun Fact

NFT communities popularized 'one of one' to market digital art as unique, though the underlying blockchain data can be copied endlessly.

Source: Definition backfill (hailey)

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