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1. often rudiments
a. A fundamental element, principle, or skill, as of a field of learning: the rudiments of calculus.
b. Something in an incipient or undeveloped form: the rudiments of social behavior in children; the rudiments of a plan of action.
2. Biology An imperfectly or incompletely developed organ or part.

[Latin rudīmentum, from rudis, rough, unformed.]

ru′di·men′tal (-mĕn′tl) adj.
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Of or treating the most basic aspects:
References in classic literature ?
If you attentively regard almost any quadruped's spine, you will be struck with the resemblance of its vertebrae to a strung necklace of dwarfed skulls, all bearing rudimental resemblance to the skull proper.
Two or three times, even, to the great astonishment of his friends, he had, when Aramis allowed some rudimental error to escape him, replaced a verb in its right tense and a noun in its case.
In the midst of this sterility, the rudimental carcass of the Globe appeared in ridges of sharply-jutting rock.
They seemed to me to be rudimental, burrowing men, still standing on their defence, awaiting their transformation.
And five young Scots were thrilled to line up against the football-mad band - despite being thrashed 20-5 by the Rudimental team.
The singer, 22, demonstrated his unlikely skills on the mic as he and pals Rudimental enjoyed a midnight rap battle at Tape nightclub's recording studio in London.
RUDIMENTAL sent revellers at day two of this year's Fusion Festival in Cofton Park home happy with a headline performance to remember.
The Foo Fighters headline at the Pyramid stage, with Rudimental top bill on the Other Stage.
SINGER Ella Eyre (left) best known for her performances with Rudimental and Naughty Boy, is releasing her first solo single next week.
Also performing were Elbow, Lily Allen and Rudimental.