A group of one or more populations of an organism or organisms seen by taxonomists to form a unit.
A measure of size or multiplicity.
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).
The process of estimating the value of a financial asset or liability.
A map from the class of open sets of a topological space to the set of positive real numbers including infinity.
A structure, and the corresponding assignment of a truth value to each sentence in the language for that structure.
An estimation of something's worth.