first language 
noun
A person’s native language: she speaks Tiwa as her first language...
- That sentence wasn't written by anyone who speaks English as a first language.
- Announcers still have to come up with something to say, and they often don't speak English as a first language.
- Managing workers who don't speak English as their first language is tricky.
- fricken
- Frick, Henry Clay
- fricking
- friction
- frictional
- frictional unemployment
- friction clutch
- friction drive
- frictioned
- frictionless
- frictionlessly
- friction tape
- friction welding
- Friday
- Friday-face
- Friday-faced
- Friday fare
- Friday feast
- Friday prayers
- Fridays
- fridge
- fridge-freezer
- fried
- Friedan, Betty
- Friedman, Milton