A measured unit that is used as the basis for measuring other things: A foot and a meter are standards of length.

The set level of poverty to meet human necessities, like food, shelter, healthcare, and water over a prolonged length of time: The absolute poverty standard is the establishment of a specific income level for a given-sized household below which the household is judged to be living in a state of poverty.

In physics, a unit of pressure equal to 760 torr, 1013.25 millibars, or 1.01325 x 10⁵ newtons per square meter: The standard atmosphere is a unit of pressure, the pressure that holds up or supports a column of mercury 760 millimeters high at sea level and at 0°C.

The actual pressure exerted by he atmosphere fluctuates around this value, which is assumed to be standard at sea level and zero degrees centigrade/32 degrees Fahrenheit, and is used when dealing with very high pressures.

The terms used here are located in this unit.

By James C. Fernald, L.H.D.; Funk & Wagnalls; New York; 1947.

A fixed set of conditions (including meteorological) to which the electrical performance data of a photovoltaic module are translated from the set of actual test conditions.

Conditions under which a module is typically tested in a laboratory.