No, not really. The term millionaire was coined to describe people who were fabulously wealthy like Bill Gates or Phillip Green are now. People who, even 100 years ago, did have incomes that ran to a million or thereabouts.
Nowadays there are many people who by chance or calculated house purchases have assets worth over a million. Taking into account the capitalised values of occupational pensions is ridiculous. An occupational pension is no more than complicated, but advantageous, annuity. Once you start to draw it, the capital has been spent to buy the annuity and is no more yours than the money you pay annually to the company who service and provide call out repairs foryour CH boiler. They provide service for a year but will not repay your money if you do not need their services.
The modern equivalent of the original millionaires are the billionaires like those named above probably have incomes measured in millions.