Which suffix is commonly associated with processes in medical terminology?

The suffix -tion is commonly used in medical terminology to denote a process or the condition resulting from an action. This suffix helps to describe a specific physiological action or the outcome of that action. For example, in terms like "respiration," it indicates the process of breathing; in "circulation," it refers to the movement of blood through the body.

The other suffixes listed serve different functions: -itis refers to inflammation (as seen in "arthritis"), -plasty denotes surgical repair or reconstruction (as in "rhinoplasty"), and -ectomy indicates surgical removal (as seen in "appendectomy"). These suffixes do not inherently describe a process but rather a specific type of medical condition or intervention. Thus, -tion stands out as the suffix that is specifically linked to processes.