Rudiment

1.

(PLURAL) (a first principle or element; a first slight beginning; a first or beginning step; one the basic rules and principles, a part or organ that has not fully grown or developed) បឋមវិធាន, វិជ្ជាជាន់ដំបូង, ខាងដើម
Example: My brother has already learned the rudiments of radio.

1.

That which is unformed or undeveloped; the principle which lies at the bottom of any development; an unfinished beginning.

2.

Hence, an element or first principle of any art or science; a beginning of any knowledge; a first step.

3.

An imperfect organ or part, or one which is never developed.

1.

(TRANSITIVE) To furnish with first principles or rules; to insrtuct in the rudiments.