Gentry is writing a report about the popularity of the community boxing club for youth. He includes information about one boy who is described as pugnacious. Which reference would help Gentry understand the description of the athlete.

To understand the description of the athlete as "pugnacious," Gentry would benefit most from using a **dictionary**. A dictionary provides definitions and explanations of words, helping him understand the meaning of "pugnacious," which refers to someone who is inclined to fight or be aggressive. A thesaurus could offer synonyms, but it wouldn't provide the definition itself.