A family of third-generation computer programming languages (c.1964 on).
A necessary commodity, a staple requirement.
An elementary building block, e.g. a fundamental piece of knowledge.
(military) Basic training.
Necessary, essential for life or some process.
Elementary, simple, fundamental, merely functional.
(chemistry) Of or pertaining to a base; having a pH greater than 7.
(informal) Unremarkable or uninteresting; boring; uncool.