Jisho

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Noun
1. root; root wordLinguistics
Wikipedia definition
2. Root (linguistics)The root word is the primary lexical unit of a word, and of a word family (root is then called base word), which carries the most significant aspects of semantic content and cannot be reduced into smaller constituents. Content words in nearly all languages contain, and may consist only of, root morphemes. However,sometimes the term "root" is also used to describe the word minus its inflectional endings, but with its lexical endings in place.
Read “Root (linguistics)” on English Wikipedia
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Read “Root (linguistics)” on DBpedia

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