quantify

verb3

1. •
   To assign a quantity to.
2. •
   To determine the value of (a variable or expression).

   • As in much of biology, the most satisfying truths in ecology derive from manipulative experimentation. Tinker with nature and quantify how it responds. — 2012
3. •
   To relate a statement (called a predicate) to a given set using a quantifier—either for all (denoted ∀) or there exists (denoted ∃).