The word "unit" refers to a single, distinct, or indivisible entity that is part of a larger whole. In various contexts, it could mean a single item, a measurement of a quantity, or a group that functions together. For example, in mathematics, a unit can represent one whole of a measure, like 1 meter or 1 liter. In education, a unit might refer to a specific section of study within a larger curriculum.
The word "unit" originates from the Latin word "unus," meaning "one," combined with the suffix "-it," which indicates a state or quality. The term was adopted into Middle French as "unité" before making its way into English in the late 15th century.