Monolithic

Adjective

1. Of or resembling a monolith.
2. Consisting of a single piece of homogeneous material as opposed to a composite material or an assembly of multiple parts.

   "A monolithic chunk of titanium with facets for cutting, wrenching, and prying."

3. Having a massive, unchanging structure that does not permit individual variation.

   "Mainstream culture is hardly the monolithic block that its caricaturization often implies."

4. Of a single structure, a singular component; instead of an assembly.

   "Monolithic space stations only have a single station module."

5. Consisting of a single program or codebase.

   "Monolithic kernels perform all operating system duties in kernel space."