Meaning of BASIC in English

[adjective] - providing the base or starting point from which something can develop; simple or without complicationI really need to get some basic financial advice.He only has a basic command of English (= He only knows the most important and simple words and expressions).The basic (= most important) problem is that they don't talk to each other enough.Being loved was basic to her happiness (= necessary for her to be happy).The car she bought was pretty basic (= had only simple features) - she didn't want one with a lot of gadgets.The rise in prices of basic foodstuffs, such as meat, cheese and sugar, has led to strikes and demonstrations.A basic salary is what a person earns before other sums of money, such as payments for working extra hours, are added.

Cambridge English vocab.      Кембриджский английский словарь.