Ace the CPCT Medical Terminology Challenge 2026 – Elevate Your Career in Healthcare!

The suffix -ion denotes an action or process, turning a verb into a noun that names the action or its result. In medical terms, it often marks the act of doing something or the state that results from that action, as in infection, digestion, or occlusion. That makes it the best fit for the meaning in question: it specifies a process rather than a sense (vision), a directional idea (driving away), or a sensation (pain). Vision relates to sight and arises from a root meaning to see; driving away isn’t conveyed by this suffix, and pain is a sensory experience described by other terms.