the act of putting someone into an official position with a ceremony, or an occasion when this happens: presidential inauguration (Definition of inauguration from the Cambridge Business English Dictionary © Cambridge University Press) Learn the definition, usage, and origin of the noun inauguration from the Oxford English Dictionary. Find out how common and how to pronounce this word in British and American English. In government and politics, inauguration is the process of swearing a person into office and thus making that person the incumbent. Such an inauguration commonly occurs through a formal ceremony or special event, which may also include an inaugural address by the new official. Inauguration is an act or ceremony of inaugurating, such as the installation of a new leader or the opening of a new institution. Learn the word origin, synonyms, collocations and usage examples from Collins Corpus.