fundamental

US /ˌfʌndəˈmɛntl/

UK /ˌfʌndəˈmentl/

A2

adjective

  • Forming a necessary part, base, or core
  • Basic and essential; forming a necessary base or core.
  • Affecting the essential nature of something; radical.
  • Of central importance.
  • So basic that it cannot be taken away or ignored.

noun

  • A basic part of something
  • A class that is the root of all other classes.
  • (Music) the lowest note in a harmony
  • A basic principle, rule, or law that serves as the groundwork of a system; an essential part.
  • A basic principle, rule, or law that serves as the groundwork of a system.
  • A basic principle, skill, or rule.

Examples

Improved funding is fundamental to the success of the project.

This principle is clear and absolutely fundamental.