primitive form

Translations
примитивная форма
первоначальная форма
исходная форма
первобытная форма
непроизводная форма
первообразная форма
Definitions
A simple, basic, or unsophisticated form.
The earliest or original form of something, before it was developed or modified.
A form that is not derived from another form; a basic or irreducible form.
In mathematics, a differential form whose exterior derivative is a given differential form.
Words
primitive

adjective
примитивная
form

noun
форма