| rudiment | (noun) the remains of a body part that was functional at an earlier stage of life | - |
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| rudimentary | (adjective) being or involving basic facts or principles | Synonyms: fundamental, underlying |
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| (adjective) being in the earliest stages of development | - |
| (adjective) not fully developed in mature animals | Synonyms: vestigial |
| rudiments | (noun) the elementary stages of any subject (usually plural) | Synonyms: alphabet, first principles |
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| (noun) a statement of fundamental facts or principles | Synonyms: basics |