This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. To put into a category or categories; classify.

v. To assign a category; to divide into classes.

v. To insert in a category or list; to class; to catalogue.

To place in a category or list; classify.

v. place into or assign to a category

"Homophobia is also a social ill, and to dismiss the ads and the idea of same sex marriage as "silly" is to once again categorize gays and lesbians as second-class citizens, unworthy of the equal protections of the laws of this country."

categorized    categorizes    categorizing   

reason   

categorisation    category    categorization   

classify    separate    sort    class    sort out   

class    catalogue    classify