Expression
Part of speech: noun
Definition: A particular way of phrasing an idea. A colloquialism or idiom. A facial appearance usually associated with an emotion. An arrangement of symbols denoting values, operations performed on them, and grouping symbols. The process of translating a gene into a protein. A piece of code in a high-level language that returns a value. Of a mother, the process of expressing milk.
Example sentence: A woman whose smile is open and whose expression is glad has a kind of beauty no matter what she wears.
Formula
Part of speech: noun
Definition: Any mathematical rule expressed symbolically.A symbolic expression of the structure of a compound.A plan of action intended to solve a problem.A formulation; a prescription; a mixture or solution made in a prescribed manner; the identity and quantities of ingredients of such a mixture.Drink given to babies to substitute for mother's milk.A syntactic expression of a proposition, built up from quantifiers, logical connectives, variables, relation and operation symbols, and, depending on the type of logic, possibly other operators such as modal, temporal, deontic or epistemic ones.
Example sentence: A long apprenticeship is the most logical way to success. The only alternative is overnight stardom, but I can't give you a formula for that.