Answer: The suffix in the word "solution" is "-tion".
Explanation: The suffix "-tion" is a common suffix in English, which is used to form abstract nouns from verbs. In the word "solution," the root word is "solve," which is a verb meaning to find an answer to a problem or a puzzle. The suffix "-tion" is added to "solve" to create the abstract noun "solution," which refers to the act or process of solving a problem or finding an answer.
In general, the "-tion" suffix is used to create abstract nouns that indicate an action, process, or state, such as "creation," "explanation," or "correction." The suffix can also be used to form nouns that describe the result or outcome of an action, such as "decision" (the result of deciding) or "completion" (the state of being finished).