What does it actually mean when we say 'fifth-generation' fighter?

When it comes to fighter jets, the modern world is currently amid a transition. The combat-proven fighters we've grown to know and love over the years are

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Fifth generation fighter jets - A Chinese, Russian, Indian and US

What does it actually mean when we say 'fifth-generation' fighter?

A.I. Brings the Robot Wingman to Aerial Combat - The New York Times

Alex Hollings, Author at Fighter Sweep - Page 33 of 34

J-20: The Stealth Fighter That Changed PLA Watching Forever – The Diplomat

Fighter generations comparison chart - The Aviationist

What makes a 5th gen fighter plane so superior to 4/4.5th gen? Why

China's J-20 fighter seems to have a new homegrown engine, after