That operates to produce an effect.
Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
An operative person or thing.
Yielding good or useful results; constructive.
Of a cough, producing mucus or sputum from the respiratory tract.
Of inflammation, producing new tissue.
Capable of producing something, especially in abundance; fertile.
Of, or relating to the creation of goods or services.
Consistently applicable to any of an open set of words.
A type of set of natural numbers, related to mathematical logic.