What does the suffix -ist mean in the word optimist?

The suffix “-ist” is used to form nouns that refer to a person who practices or is concerned with something, or holds certain principles or beliefs. In the case of the word “optimist,” the prefix “opt-” comes from the Latin “optare,” meaning “to choose” or “to wish.” Therefore, an “optimist” is a person who tends to be hopeful and expects positive outcomes; they have a disposition to see the best in situations. This suffix is commonly found in various words, such as “artist” (a person who practices art), “scientist” (a person engaged in scientific study), and “activist” (a person who actively promotes a cause). The use of “-ist” thus indicates a specialized role or belief system associated with the root of the word.