firm - flui
- firm (natural gas) service
- firm (natural gas) service
- firm allocation
- firm capacity
- firm customer
- firm discharge
- firm name
- firm planned order
- firm yield of 95%
- firm-wired numerical control
- Firms
- firmware
- firmware-driven
- FIRO
- FIRQ
- FIRST
- first Akaike criterion
- first antiderivative
- first assembly where-used address
- first average
- first backward difference operator
- first break
- first choice route
- first core charging
- first core inventory
- first derivative square integrable function
- first diffracted order
- first diffracted order aperture
- first electroform
- first family gases
- first fire
- first fit
- first fit decreasing
- first flush
- first frame posting
- first frame saw
- first fuel charge
- first gang frame saw
- first gimbal ring
- first group selector
