Real Dictionary

basic
a cell in connective tissue that synthesizes collagen [...]
a fundamental principle, fact, etc [...]
an element or cause that contributes to a result [...]
any of a large group of nitrogenous compounds of high molecular weight that are essential constituents of all living organisms. They consist of one or more chains of amino acids linked by peptide bonds and are folded into a specific three-dimensional shap
any substance that dissociates in water to yield a sour corrosive solution containing hydrogen ions, having a pH of less than 7, and turning litmus red [...]
Basic goods and services are very simple ones which every human being needs. You can also refer to people's basic needs for such goods and services.
Basic is used to describe a price or someone's income when this does not include any additional amounts.
matter remaining after something has been removed [...]
of, consisting of, or containing the group of atoms -NH2 [...]
The basic rate of income tax is the lowest or most common rate, which applies to people who earn average incomes.
the process or act of growing, esp in organisms following assimilation of food [...]
You can use basic to emphasize that you are referring to what you consider to be the most important aspect of a situation, and that you are not concerned with less important details.
You use basic to describe things, activities, and principles that are very important or necessary, and on which others depend.
adjective: If one thing is basic to another, it is absolutely necessary to it, and the second thing cannot exist, succeed, or be imagined without it.
adjective: You can use basic to describe something that is very simple in style and has only the most necessary features, without any luxuries.