pro·duc·tiv·i·ty 
(prō′dŭk-tĭvĭ-tē, prŏd′ək-)
(prō′dŭk-tĭvĭ-tē, prŏd′ək-)n.
1. The quality of being productive.
2. Economics The rate at which goods or services are produced especially output per unit of labor.
3. Ecology The rate at which photosynthesizing or chemosynthesizing producers form organic substances that can be used as food by consumers.
- Frederick Chapman
- (Frederick) Childe
- Frederick Grant
- Frederick I
- Frederick II
- Frederick II
- Frederick IX
- Frederick Jackson
- Frederick James
- Frederick Law
- (Frederick) Louis
- Frederick Moore
- Fredericksburg
- Frederick the Great.
- Frederick the Great
- Frederick William
- Frederick William I
- Frederick William II
- Frederick William III
- Frederick William IV
- Frederick Winslow
- (Frederic) Ogden
- Fredericton
- Frederic William
- F(rederik) W(illem)