A GRAND OPENING is a celebratory event that marks the official OPENING of a new business, store, or other establishment. The crossword solutions for the term GRAND OPENING are GEE (3 letters), CHASM (5 letters), MEGA (4 letters), MGM (3 letters), DEBUT (5 letters), and PREMIERE (8 letters). GEE stands for 'great excitement and enthusiasm, ' CHASM is a deep and wide gap, MEGA means 'very large, ' MGM is an American media company, DEBUT is a first appearance, and PREMIERE is a first public performance.