Võrdus

Võrdus is an Estonian noun meaning equality or proportion. It is used to describe the state or relation in which two quantities have the same value, and it forms the basis of mathematical and logical notions of sameness. The root is võrd-, from võrdne meaning "equal."

In mathematics and logic, võrdus denotes an equation or an assertion of equality between two expressions. It is the fundamental idea behind algebraic equations, identities, and more general equivalence relations in formal logic. In Estonian mathematical notation, the symbol for equality is called the võrdusmärk.

In broader usage, võrdus can refer to equality in social or legal contexts, such as equal treatment or parity before the law. In technical and educational writing, however, the mathematical sense is often primary. The term is common in textbooks, lectures, and discussions of proportionality, balance, and fairness, reflecting the central role of equality across disciplines.