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[roo-duh-men-tuh-ree, -tree] /ˌru dəˈmɛn tə ri, -tri/
pertaining to rudiments or first principles; elementary:
a rudimentary knowledge of geometry.
of the nature of a rudiment; undeveloped or vestigial.
Also, rudimental.
Origin of rudimentary
1830-40; rudiment + -ary
Related forms
[roo-duh-men-tair-uh-lee, -men-ter-uh-lee] /ˌru də mɛnˈtɛər ə li, -ˈmɛn tər ə li/ (Show IPA),
rudimentariness, noun
nonrudimental, adjective
nonrudimentarily, adverb
nonrudimentarilyness, noun
nonrudimentary, adjective
1. fundamental, initial. See elementary. 2. embryonic.
1. advanced. 2. mature. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rudimentary
  • But, actually, ants can do it in a rudimentary form.
  • They usually have little background in health care and only rudimentary training.
  • Government regulations covering orbital debris are still rudimentary.
  • The key precondition for this sort of marketplace is the presence of rudimentary secular values.
  • Climbing gear was rudimentary-some pitons were hammered out of stove legs.
  • Blind mice developed rudimentary vision when researchers activated certain retinal cells using a gene commonly found in algae.
  • Only a rudimentary knowledge of grammar is required because the syntax is already laid out for you.
  • So far these microstructures are rudimentary--far from the structural sophistication of a whole organ.
  • Atmospheric physics is so complex that climate scientists have only a rudimentary understanding of how it works.
  • Communications and information-gathering capabilities are either rudimentary or non-existent.
British Dictionary definitions for rudimentary


basic; fundamental; not elaborated or perfected
incompletely developed; vestigial: rudimentary leaves
Derived Forms
rudimentarily, (rare) rudimentally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rudimentary

1827; see rudiment + -ary. Earlier was rudimental (1590s).

Online Etymology Dictionary, © 2010 Douglas Harper
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rudimentary in Medicine

rudimentary ru·di·men·ta·ry (rōō'də-měn'tə-rē, -měn'trē)

  1. Being imperfectly or incompletely developed; embryonic.

  2. Being in the earliest stages of development; incipient.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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