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.
- scientifical method
- scientificalness
- scientific calculator
- scientific creationism
- scientific creationist
- scientific farmer
- scientific farming
- scientific humanism
- scientific humanist
- scientificism
- scientificity
- scientific journal
- scientific Latin
- scientific management
- scientific method
- scientific misconduct
- scientific name
- scientificness
- scientific notation
- scientific racism
- scientific revolution
- scientific romance
- scientifics
- scientific socialism
- scientific socialist