Formula

n.; Lat. pl. FŌR'MU-LÆ; Eng. pl. FŌR'MU-LAS. [Lat., dim. of forma, form, model; Fr. formule.]

1. A prescribed or set form; an established rule; a fixed or conventional method in which any thing is to be done, arranged, said, or the like.
2. (Eccl.) A written confession of faith; a formal statement of doctrines.
3. (Math.) A rule or principle expressed in algebraic language; as, the binomial formula.
4. (Med.) A prescription or recipe.
5. (Chem.) An expression by means of symbols and letters of the constituents of a compound; as, a rational formula, which gives the exact proportion and grouping of the elements, or an irrational or empirical formula, which does not.