Definition
Certain is an adjective used to express confidence in something as true or established, or to indicate something specific but not explicitly named. It also describes a level of assurance in one's knowledge or understanding.
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Etymology
The word "certain" comes from the Old French "certain," meaning "sure or assured," and from the Latin "certus," which means "settled" or "determined." It entered English in the Middle Ages and has retained its meaning of assuredness and specificity.
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Usage
The adjective "certain" is often used to express assurance, such as "She was certain of her decision." It is also used to denote a specific but unnamed item or quality, as in "Certain aspects of the plan need revision."
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Detailed Definitions