What does the suffix "-ion" signify in medical terminology?

The suffix "-ion" in medical terminology signifies "the process of." This means that when you see this suffix attached to a root word, it indicates an action or a process related to the root. For example, in the term "digestion," the suffix "-ion" indicates the process of breaking down food in the digestive system. Therefore, it conveys an active sense of what is happening rather than simply describing a state, condition, specialty, or field of study.

The other options refer to different suffixes with distinct meanings. For instance, the suffix that indicates "the state or condition of" would be "-ity" or "-ness," while "-ist" suggests a person who specializes in a particular field and "-logy" refers to "the study of." Each of these suffixes adds a different nuance to the medical terminology, but in this case, "-ion" specifically denotes an ongoing process.