How to clean and lube a treadmill. Sep 23, 2025 · clean (third-person singular simple present cleans, present participle cleaning, simple past and past participle cleaned) (transitive) To remove dirt from a place or object. Define clean. [~ + object + out] I cleaned it out before dinner. If something cleans easily, it is easy to clean. Learn more. How to use clean in a sentence. clean·er , clean·est 1. adj. clean synonyms, clean pronunciation, clean translation, English dictionary definition of clean. Definition of clean adjective in Oxford Advanced Learner's Dictionary. Synonyms for CLEAN: spotless, immaculate, pristine, stainless, spick-and-span, squeaky-clean, shiny, unsullied; Antonyms of CLEAN: dirty, unclean, filthy, stained, soiled, foul, uncleaned, grubby clean adjective (NO CRIME) showing that you have not done anything illegal: a clean driving licence I spent the morning cleaning the house. The meaning of CLEAN is free from dirt or pollution. (Definition of clean from the Webster's Essential Mini Dictionary © Cambridge University Press) The meaning of CLEAN is free from dirt or pollution. free from any dirty marks, pollution, bacteria, etc. (Definition of clean from the Webster's Essential Mini Dictionary © Cambridge University Press) Make sure your hands are clean before you have your dinner. Free from foreign matter or If you clean something or clean dirt off it, you make it free from dirt and unwanted marks, for example by washing or wiping it. a. (Definition of clean from the Webster's Essential Mini Dictionary © Cambridge University Press). CLEAN definition: 1. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. honest or fair, or showing that you…. Hospitals need to be kept spotlessly (= extremely) clean. : 2. to empty in order to straighten or clean: [~ + out + object] I had to clean out my desk to find what I was looking for. Free from dirt, stain, or impurities; unsoiled: a clean kitchen floor; clean clothes. The meaning of CLEAN is free from dirt or pollution. 2.