productivity

adjective

1. producing abundantly; fertile productive soil, a productive mind
2. marked by abundant production or effective results a productive day
3. bringing as a result (with of) war is productive of much misery
4. Econ. of or engaged in the creating of economic value, or the producing of goods and services
5. Linguis. designating any affix or method which can be and still is used to make new forms “non-” is a productive prefix

Etymology: ML productivus < LL, fit for prolongation < L productus, pp. of producere: see produce