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Adjective: rudimentary  ,roo-du'men-t(u-)ree
  1. Being or involving basic facts or principles
    "these rudimentary truths";
    - fundamental, underlying
     
  2. Being in the earliest stages of development
    "rudimentary plans"
     
  3. (biology) not fully developed in mature animals
    "rudimentary wings";
    - vestigial

See also: basic, incomplete, uncomplete, undeveloped