tycoon

A tycoon is a "wealthy and powerful businessperson or industrialist; a magnate." The word has a Japanese origin from the word taikun of Chinese origin, meaning title of a shogun.

Word History from the AHD:

"It has been claimed that in today's global economy some business leaders have more power than heads of states. It is etymologically fitting that such leaders are sometimes called tycoons. Tycoon came into English from Japanese, which had borrowed the title, meaning "great prince," from Chinese. Use of the word was intended to make the shogun, the commander in chief of the Japanese army, more impressive to foreigners (his official title shōgun merely meant "general"). It worked with Matthew C. Perry, who opened Japan to the West in 1854; Perry carried out his negotiations with the shogun, thinking him to be the emperor. In fact, the shogun did rule Japan, although he was supposedly acting for the emperor. The shogun's title, taikun, was brought back to the United States after Perry's visit. Abraham Lincoln's cabinet members used tycoon as an affectionate nickname for the President. The word soon came to be used for business and industry leaders—at times being applied to figures like J. P. Morgan, who may indeed have wielded more power than many princes and presidents."

--American Heritage College Dictionary Fourth Edition