What is Formula ?
Formula is (noun) 1. a statement of a scientific fact, often shown by means of symbols The chemical formula of carbon dioxide is CO2.. The drug is made to a secret formula. 2. a formula for disaster something which will certainly lead to problems The management’s approach is a formula for disaster. 3. a series of set words to express something the formula to start a letter to the Queen (NOTE: [all senses] The plural is formulae .)
source: Easier English, Student Dictionary Upper Intermediate Level