The Rice University Neologisms Database

One whose wealth is nearly infinite. This word was probably coined to convey the idea of unequaled wealth. The terms millionaire or billionaire seem ordinary and unimpressive nowadays. This necessitates creating the word 'infinicionaire' to express the idea of a person far wealthier than even a billionaire. Because this word was used by a calculus professor, it may have been inspired by the idea of limits in calculus. As a quantity gets larger and larger, it approaches infinity. Likewise, as a person gets wealthier and wealthier they approach the state of being an infinicionaire.