adjective

• Capable of producing something, especially in abundance; fertile.
• Yielding good or useful results; constructive.
• Of, or relating to the creation of goods or services.
• (linguistics, of an affix or word construction rule) Consistently applicable to any of an open set of words.
• (medicine) Of a cough, producing mucus or sputum from the respiratory tract.
• (medicine) Of inflammation, producing new tissue.
• (set theory) A type of set of natural numbers, related to mathematical logic.