form - func
- free-space attenuation
- free-space characteristic impedance
- free-space field
- free-space field intensity
- free-space loss
- free-space optical interconnection
- free-space power transmission
- free-space propagation
- free-space radar equation
- free-space radiation
- free-space radiation pattern
- free-space range
- free-space wave velocity
- free-space wavelength
- free-standing
- freedom
- Freedom of Information Act
- freely distributable software
- Freenet
- freeware
