effective, average, marginal. -The effective tax rate is the best measure of the tax burden because it is the average level of tax on all income from taxable and nontaxable sources. -The average tax rate measures the average level of tax on only taxable income.
Navigating the eschaton. The eschaton is something to be avoided and something to be courted. It is a virtual singularity of human consciousness marking the end of the historical epoch. In itself it is a neutral event, one to be reckoned with. It is a point of leverage for wielding the human spirit.
Stat means switch. An aquastat is just a switch that turns the boiler on and off to maintain the right water temperature. An aquastat is made up of only three simple parts: a switch, a temperature-sensing element (also called a bulb), and a capillary tube that connects the two.