Clean means free from dirt, dust, stains, or unwanted substances, but its meaning extends across physical, moral, and technical domains. Physically, clean describes something that has been washed or kept free of impurities, such as clean clothes, clean dishes, or a clean room. In hygiene, clean means sanitary and free from harmful germs to an acceptable level, not necessarily sterile but safe. Morally, clean means innocent, pure, or free from wrongdoing, as in a clean conscience or clean record. In slang, clean can mean sober from drugs and alcohol, stylish and neat in appearance, or well-executed as in a clean performance. In data and technology, clean means free from errors, corruption, or unnecessary elements, such as clean code or clean data. The core idea across all uses is absence of unwanted elements, whether dirt, guilt, errors, or contaminants. Clean can be a verb meaning to make something free of dirt, an adjective describing its state, and an adverb meaning completely.
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