The term "first appearance" can be replaced with various synonyms. One common synonym is "debut," which refers to the initial introduction or presentation of something or someone. Another similar word is "premiere," which is often used to describe the first showing of a movie or play. "Inaugural" is another synonym that describes the first occurrence of an event or ceremony. "Opening," "initial," "maiden," and "inauguration" are other words that can be used instead of "first appearance." Depending on the context, any of these synonyms can be used interchangeably with the term "first appearance" to convey the same meaning effectively.