Definition of rudiment
1 : a basic principle or element or a fundamental skill —usually used in plural <teaching themselves the rudiments of rational government — G. B. Galanti>
2 a : something unformed or undeveloped : beginning —usually used in plural <the rudiments of a plan> b (1) : a body part so deficient in size or structure as to be entirely unable to perform its normal function (2) : an organ just beginning to develop : anlage
Origin of rudiment
Latin rudimentum beginning, from rudis raw, rude
First Known Use: 1548
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