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The term that best describes the cleanliness level free from living microorganisms is "sterile." Sterility implies that all forms of microbial life, including bacteria, viruses, fungi, and spores, have been eradicated. This level of cleanliness is crucial in settings such as hospitals, laboratories, and when performing certain medical procedures, to minimize the risk of infections.

In contrast, the other terms refer to different levels of cleanliness. "Sanitary" typically refers to conditions that are hygienic but not necessarily free of all microorganisms; it aims to reduce the number of pathogens to a safe level. "Clean" generally indicates the removal of dirt and impurities but does not guarantee the absence of microorganisms. "Disinfected" denotes the reduction of pathogenic organisms to a level that is not harmful; however, it may not eliminate all microorganisms, especially spores. Therefore, in this context of achieving total microbial absence, "sterile" is the most appropriate term.