| Fermentation | (Environmental Engineering) Energy production without the benefit of oxygen as a terminal electron acceptor, i.e. oxidation in which the net effect is one organic compound oxidizing another. See respiration. |
| Fixed solids | (Environmental Engineering) (FS) are the solids that do not volatilize at 550°C. |
| Fixed suspended solids | (Environmental Engineering) (FSS) is the matter remaining from the suspended solids analysis which will not burn at 550°C. It represents the non-filterable inorganic residue in a sample. |
| Flocculant settling | (Environmental Engineering) Settling in which particle concentrations are sufficiently high that particle agglomeration occurs. This results in a reduction in the number of particles and an increase in average particle mass. As agglomeration occurs higher settling velocities result. |
| Fluidization | (Environmental Engineering) The suspension of particles by sufficient upward velocity of the fluid. During fluidization the gravity force is overcome by a combination of buoyancy and fluid friction. |
| Factoring - | (Software Engineering) a technique that distributes control and work in a top-down manner within a software architecture (used a part of structured analysis) |
| FAST - | (Software Engineering) Facilitated application specification techniques, a structured meeting between developer and customer; intent is to define basic requirementsFormal methods - |
| Formal technical reviews - | (Software Engineering) a structured meeting conducted by software engineering with the intent of uncovering errors in some deliverable or work product |
| Formulation - | (Software Engineering) a Web engineering action that identifies business need, describes WebApp objectives, defines major features and functions, and establishes mechanisms for requirements gathering |
| Function points - | (Software Engineering) a measure of the utility delivered by an application |