[ roo-duh-men-tuh-ree, -tree ]
/ ˌru dəˈmɛn tə ri, -tri /
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pertaining to rudiments or first principles; elementary: a rudimentary knowledge of geometry.
Biology. of the nature of a rudiment; undeveloped or vestigial.
in an early, imperfect stage or form: How can we improve upon this admittedly rudimentary theory?



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Often ru·di·men·tal [roo-duh-men-tl] /ˌru dəˈmɛn tl/ .

Origin of rudimentary

First recorded in 1600–20; rudiment + -ary

synonym study for rudimentary

1. See elementary.

OTHER WORDS FROM rudimentary

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use rudimentary in a sentence

British Dictionary definitions for rudimentary


less commonly rudimental

/ (ˌruːdɪˈmɛntərɪ) /


basic; fundamental; not elaborated or perfected
incompletely developed; vestigialrudimentary leaves

Derived forms of rudimentary

rudimentarily or 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

Medical definitions for rudimentary

[ rōō′də-mĕntə-rē, -mĕntrē ]


Being imperfectly or incompletely developed; embryonic.
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.