A trillionaire is someone who has amassed a fortune worth at least one trillion dollars, making them one of the wealthiest people in the world. While the term trillionaire is used to describe an extremely limited number of people, several other terms may be used to describe an individual with immense wealth. Some possible synonyms for the word trillionaire include a "megabillionaire," a "multibillionaire," a "centibillionaire," a "decabillionaire," or a "quadrillionaire." Despite their labeling, all of these terms are meant to portray an individual who is extraordinarily wealthy and has more money than they could ever spend in their lifetime.