From the French word meaning 'slice' - this term is used in relation to the drawing down or payment of 'slices' or 'tranches' of funds used for business.
Impress your friends at dinner parties! It's a very sophisticated word for a financial instalment. From the French meaning 'slice' - it refers to the pattern of cash inflows or outflows for a loan or security. Try saying to your partner 'Darling, did we pay the final tranche of the HP agreement on our car.' and see what response you get.