fundamental
US /ˌfʌndəˈmɛntl/
・UK /ˌfʌndəˈmentl/
A2
adjective
- Forming a necessary part, base, or core
- Basic and essential.
- Of central importance.
noun
- A basic part of something
- (Music) the lowest note in a harmony
- A basic principle, rule, or law that serves as the groundwork of a system.