The word "only" is used to indicate that something is singular or unique. It implies exclusivity, suggesting that no other option, possibility, or choice is available. In contexts, it can also emphasize a limitation or a specific characteristic.
The word "only" comes from the Old English "ánlīc," which means "one-like" or "singular." It is derived from "ān," meaning "one," combined with the suffix "-ly," which can denote manner or quality. The term evolved over time into its current form and meaning.