As a noun carton
is cardboard, paperboard.
As an adjective undefined is
lacking a definition or value.
An inexpensive, disposable box-like creation fashioned from either paper, paper with wax-covering (wax paper), or other lightweight material. It is designed to hold things for a short period of time and be discarded or recycled after use.
Lacking a definition or value.
(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
- The result of division by zero is undefined .