rudimentary
1. [ adjective ] being in the earliest stages of development
Examples:

"rudimentary plans"

Related terms: incomplete
2. [ adjective ] being or involving basic facts or principles
Synonyms: fundamental underlying
Examples:

"the fundamental laws of the universe" "a fundamental incompatibility between them" "these rudimentary truths" "underlying principles"

Related terms: basic
3. [ adjective ] (biology) not fully developed in mature animals
Synonyms: vestigial
Examples:

"rudimentary wings"

Related terms: biology undeveloped
Similar spelling:   rudiment
  rudiments