From Wikipedia:Financialization is a term sometimes used in discussions of financial capitalism which developed over recent decades, in which financial leverage tended to override capital (equity) and financial markets tended to dominate over the traditional industrial economy and agricultural economics.
Financialization is a term that describes an economic system or process that attempts to reduce all value that is exchanged (whether tangible, intangible, future or present promises, etc.) either into a financial instrument or a derivative of a financial instrument. The original intent of financialization is to be able to reduce any work-product or service to an exchangeable financial instrument, like currency, and thus make it easier for people to trade these financial instruments.
To break this down even simpler -