rudimentary rudimentary /ˌruːdəˈmɛntɝi/

adjective

1. () Being in the earliest stages of development  ( rudimentary )
   being in the earliest stages of development
    Rudimentary plans
   rudimentary plans
   
2. () Being or involving basic facts or principles  ( underlying , rudimentary , fundamental )
   being or involving basic facts or principles
    The fundamental laws of the universe
   the fundamental laws of the universe
    A fundamental incompatibility between them
   a fundamental incompatibility between them
    These rudimentary truths
   these rudimentary truths
    Underlying principles
   underlying principles
   
3. (biology) not fully developed in mature animals  ( rudimentary , vestigial )
   (biology) not fully developed in mature animals
    Rudimentary wings
   rudimentary wings