Noun

1. An estimation of something's worth.
2. The process of estimating the market value of a financial asset or liability.
3. An assignment of truth values to propositional variables, with a corresponding assignment of truth values to all propositional formulas with those variables.
4. A structure, and the corresponding assignment of a truth value to each sentence in the language for that structure.
5. A measure of size or multiplicity.
6. A map from the class of open sets of a topological space to the set of positive real numbers including infinity.