(logic) Any of a set of rules used to construct well-formed formulas of a formal language.

A new formation (a subsequent coming together of the elements of a former grouping)

Alternative spelling of back-formation.

(uncountable, linguistics) The process by which a new word is formed from an older word by interpreting the former as a derivative of the latter, often by removing a morpheme (real or perceived) from the older word, such as the verb burgle, formed by removing -ar (perceived as an agent-noun suffix) from burglar.

(chemistry) The sodium salt of formic acid; used in detergents, as a food preservative and in many industrial applications.

(chemistry) the calcium salt of formic acid; used in the scrubbing of flue gases, and as a food preservative

(biology) The mechanism in developing tissue by which originally similar cells acquire diverse forms and functions by coordinated cell fate control.

A natural layer of water inside oil and gas reservoirs.

(inorganic chemistry) A salt of formic acid, formula CHKO₂.

(linguistics) the formation of new words by the processes of derivation and composition