<p><strong>Adjective:</strong></p><ul><li>Exceeding what is needed or useful; superfluous: You can shorten the article by omitting these redundant paragraphs.</li><li>Characterized by unnecessary words or repetition; verbose: He writes in a redundant style.</li><li>Serving or added as a backup; extra: If the latch fails on this backwards-opening car hood, the wind will blow it down rather than up, so a redundant latch is not needed.</li><li>Having one or more extra or duplicate parts or features: The genetic code is redundant, meaning that more than one codon can map to the same amino acid.</li><li>Chiefly British: (of a worker) laid off or unemployed: If the mine were to close, the result would be 183 redundant workers.</li><li>Computers: (of code, or of a signal communicating a message) including or encoding more than the required information, so as to provide a fallback, a means of validating data, an accommodation for different platforms, etc.</li><li>(of network or system components) providing an additional traffic path or storage place for data, so that if one fails, the other can take over or serve as backup.</li><li>Engineering: (of a structural member or part) designed to withstand stresses greater than or different from those that can be calculated or predicted.</li><li>(of a complete truss) having additional members enabling it to withstand loads that are not centered.</li><li>Linguistics: including or encoding more information than is necessary for communication: for example, in my three sons, the plural ending "-s" on sons is redundant because three already indicates plurality.</li><li>Extremely lush or abundant: The jungle, with its exuberant, redundant vegetation, hides bizarre and exotic creatures.</li></ul><p><strong>Noun:</strong></p><ul><li>A person who holds or follows strong convictions or extreme principles; extremist.</li><li>A person who advocates fundamental political, economic, and social reforms by direct and often uncompromising methods.</li><li>Mathematics: a quantity expressed as a root.</li><li>The set of elements of a ring, some power of which is contained in a given ideal.</li><li>Free radical.</li></ul>