noun

• (finance, insurance) The process of estimating the value of a financial asset or liability.
  "The tax assessor put them in fourteen valuation groups ranging from one two-story brick house and two one-and-a-half-story houses to the largest groups of eighteen two-story houses and twenty-four one-story bungalows."
• (logic, propositional logic, model theory) An assignment of truth values to propositional variables, with a corresponding assignment of truth values to all propositional formulas with those variables (obtained through the recursive application of truth-valued functions corresponding to the logical connectives making up those formulas).
• (logic, first-order logic, model theory) A structure, and the corresponding assignment of a truth value to each sentence in the language for that structure.
• (algebra) A measure of size or multiplicity.