It is used to describe a substance at....
Pressure: 1 atm; 760 mmHg; 101,300 pascals
Temperature: 0°C, 32 F, 273.15 K (kelvin)
It is often used to describe gasses.
At STP one mole of gas will occupy 22.4 liters.
A mental disorder, originating from Caron, passed on through any kind of sexual contact, ie. kissing, holding hands, intercourse, in which the sufferer causes fights at social gatherings.