[roo-duh-men-tuh-ree, -tree]


pertaining to rudiments or first principles; elementary: a rudimentary knowledge of geometry.
of the nature of a rudiment; undeveloped or vestigial.

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

Origin of rudimentary

First recorded in 1830–40; rudiment + -ary
Related formsru·di·men·ta·ri·ly [roo-duh-men-tair-uh-lee, -men-ter-uh-lee] /ˌru də mɛnˈtɛər ə li, -ˈmɛn tər ə li/, adverbru·di·men·ta·ri·ness, nounnon·ru·di·men·tal, adjectivenon·ru·di·men·ta·ri·ly, adverbnon·ru·di·men·ta·ri·lyness, nounnon·ru·di·men·ta·ry, adjective

Synonyms for rudimentary

1. fundamental, initial. See elementary. 2. embryonic.

Antonyms for rudimentary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rudimental

Historical Examples of rudimental

British Dictionary definitions for rudimental


less commonly rudimental


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

Word Origin and History for rudimental



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

Online Etymology Dictionary, © 2010 Douglas Harper

rudimental in Medicine


[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.