1. a book with a blue cover containing official government information, statistics, or regulations
Usage: often capitalized when referring to a specific official publication
2. a standardized test booklet with blue covers used in schools and universities for written examinations
Usage: common in academic settings
3. a reference guide for citation and legal writing style, especially in law schools
Usage: often capitalized as 'The Bluebook'; field-specific to legal writing

Examples

• The student picked up a bluebook before entering the exam room.
• The government published a bluebook detailing the new regulations.
• Law students must learn The Bluebook citation system in their first year.
• She filled out three bluebooks during the final exam.
• The bluebook contained official statistics on employment and wages.