noun: (usually plural) a necessary commodity for which demand is constant
noun: a popular programming language that is relatively easy to learn; an acronym for beginner's all-purpose symbolic instruction code; no longer in general use
adjective: pertaining to or constituting a base or basis
Example: "A basic fact"
adjective: reduced to the simplest and most significant form possible without loss of generality
Example: "A basic story line"
adjective: of or denoting or of the nature of or containing a base