Should the word bilingual be capitalized?

No, "bilingual" is not capitalized unless it's the first word of a sentence or part of a proper noun.

Here are some examples:

* Correct: He is bilingual in Spanish and English.

* Correct: The Bilingual Education Act was passed in 1968.

* Incorrect: She is a Bilingual.

It's important to remember that while "bilingual" is an adjective describing a person or language, it's not a proper noun like a name or a specific title.