[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.
Also, rudimental.

1830–40; rudiment + -ary

rudimentarily [roo-duh-men-tair-uh-lee, -men-ter-uh-lee] , adverb
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. 2014.
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World English Dictionary
rudimentary or rudimental (ˌruːdɪˈmɛntərɪ)
1.  basic; fundamental; not elaborated or perfected
2.  incompletely developed; vestigial: rudimentary leaves
rudimental or rudimental
rudi'mentarily or rudimental
rudi'mentally or rudimental

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1839, from rudiment.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Matching Quote
"As it grew later in the afternoon, and we rowed leisurely up the gentle stream, shut in between fragrant and blooming banks, where we had first pitched our tent, and drew nearer to the fields where our lives had passed, we seemed to detect the hues of our native sky in the southwest horizon. The sun was just setting behind the edge of a wooded hill, so rich a sunset as would never have ended but for some reason unknown to men, and to be marked with brighter colors than ordinary in the scroll of time. Though the shadows of the hills were beginning to steal over the stream, the whole river valley undulated with mild light, purer and more memorable than the noon. For so day bids farewell even to solitary vales uninhabited by man. Two herons (Ardea herodias), with their long and slender limbs relieved against the sky, were seen traveling high over our heads,—their lofty and silent flight, as they were wending their way at evening, surely not to alight in any marsh on the earth's surface, but, perchance, on the other side of our atmosphere, a symbol for the ages to study.... The last vestiges of daylight at length disappeared, and as we rowed silently along with our backs toward home through the darkness, only a few stars being visible, we had little to say, but sat absorbed in thought, or in silence listened to the monotonous sound of our oars, a sort of rudimental music, suitable for the ear of Night and the acoustics of her dimly lighted halls;
"Pulsae referunt ad sidera valles,"
and the valleys echoed the sound of the stars."
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