How would Juan's ability to communicate in both English and his native language be best described?

Juan's ability to communicate in both English and his native language is best described as bilingual. Being bilingual means that an individual has proficiency in two languages. This includes the ability to speak, understand, read, and write in both languages, enabling effective communication in different contexts.

In contrast, monolingual refers to someone who speaks only one language. Trilingual would apply if Juan could communicate fluently in three languages, while multilingual denotes proficiency in more than two languages. Since the scenario specifies Juan communicates in exactly two languages, bilingual is the most accurate description of his abilities.