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

plural of formation rule

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

(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.

(linguistics) of or pertaining to word formation; morphological

Alternative form of word formation

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

parade lap

(American football) A common offensive formation, beginning with the usual five offensive linemen (two offensive tackles, two guards, and a center), the quarterback under center, and two backs in-line behind the quarterback. The base variant adds a tight end to one side of the line and two wide receivers, one at each end of the line.