primitive

Short definition from Wiktionary

Noun

1. 1
   An original or primary word; a word not derived from another, as opposed to derivative.
2. 2
   A member of a primitive society.
3. 3
   A simple-minded person.
4. 4
   A data type that is built into the programming language, as opposed to more complex structures.
5. 5
   Any of the simplest elements (instructions, statements, etc.) available in a programming language.
6. 6
   A basic geometric shape from which more complex shapes can be constructed.
7. 7
   A function whose derivative is a given function; an antiderivative.

Adjective

1. 1
   Of or pertaining to the beginning or origin, or to early times; original; primordial; primeval; first.
2. 2
   Of or pertaining to or harking back to a former time; old-fashioned; characterized by simplicity.
3. 3
   Of or pertaining to or harking back to a former time; old-fashioned; characterized by simplicity: Relating to an art style characterized by asymmetrical shapes and faded colors.
4. 4
   Crude, obsolete.
5. 5
   Original; primary; radical; not derived.
6. 6
   Occurring in or characteristic of an early stage of development or evolution.
7. 7
   Not derived from another of the same type
8. 8
   most recent common ancestor (often hypothetical) of