Clean (programming language), a purely functional programming language Clean language, a questioning technique used in psychotherapy and coaching Money laundering, a way of cleaning "dirty" money.
Define clean. clean synonyms, clean pronunciation, clean translation, English dictionary definition of clean. adj. clean·er , clean·est 1. Free from dirt, stain, or impurities; unsoiled: a clean kitchen floor; clean clothes. 2. a. Free from foreign matter or...