basic

/ˈbā-sik/

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adjective

  1. of, relating to, or forming the base or essence : fundamental

  2. concerned with fundamental scientific principles : not, applied

  3. constituting or serving as the basis or starting point

basic truths

basic research

noun

  1. something that is basic : fundamental

  2. basic training

get back to basics

noun

  1. a simplified high-level language for programming a computer

The program was written in BASIC.