What is "flat white"

n. (context Australia New Zealand English) A type of white coffee made with espresso coffee and hot milk.

A flat white is a coffee beverage. The beverage is prepared by pouring microfoam (steamed milk consisting of small, fine bubbles with a glossy or velvety consistency) over a shot of espresso. It is somewhat similar to the traditional cappuccino or the latte although smaller in volume, therefore having a higher proportion of coffee to milk, and milk that is more velvety in consistency – allowing the espresso to dominate the flavour, while being supported by the milk.