Basic: simple and not complicated, so able to provide the base or starting point from which something can develop:
He only has a basic command of English (= he only knows the most important and simple words and expressions).
It’s the most basic model (= it only has the most simple features).
The crisis has led to price rises in basic foodstuffs, such as meat, cheese, and sugar.
The 200-year-old jail is overcrowded, understaffed, and lacking in basic amenities.
- Elementary: basic:
I have an elementary knowledge of physics.
They made some elementary mistakes.
Millions of travellers fail to take even the most elementary of precautions.
- Fundamental: forming the base, from which everything else develops:
We need to make fundamental changes to the way in which we treat our environment.
It’s one of the fundamental differences between men and women.
The school is based on the fundamental principle that each child should develop its full potential.
Diversity is of fundamental importance to all ecosystems and all economies.
- Rudimentary: basic:
Her knowledge is still only rudimentary.