Centennially is an adverb that means "once every hundred years" or "in celebration of a hundredth anniversary". There are several synonyms for this word, including "centenary", "centennial", "centurial", "centennially", and "bicentenary". These terms are often used in reference to important events or milestones that mark the passing of time. For example, a centennial celebration may mark the 100th anniversary of an organization, while a bicentennial celebration may mark the 200th anniversary of a nation. Whatever the occasion, these words remind us of the significance of historical and cultural events and the importance of recognizing them through commemoration and celebration.