The class of scale or magnitude of any amount, where each class contains values of a fixed ratio (most often 10) to the class preceding it. For example, something that is 2 orders of magnitude larger is 100 times larger, something that is 3 orders of magnitude larger is 1000 times larger, and something that is 6 orders of magnitude larger is a million times larger, because 10² = 100, 10³ = 1000, and 10⁶ = a million.
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.