The term BUS. ABBR. is an abbreviation for 'BUSINESS'. The crossword solutions for this term are CORP (4 letters) and INC (3 letters). CORP stands for 'CORPORATION' and INC stands for 'INCORPORATED'. These terms are used to describe a BUSINESS entity that is legally recognized as a separate entity from its owners. A CORPORATION is owned by shareholders and is managed by a board of directors, while an INCORPORATED BUSINESS is owned by one or more individuals. Both types of businesses have limited liability and can issue stock.