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base:see acids and basesacids and bases,
two related classes of chemicals; the members of each class have a number of common properties when dissolved in a solvent, usually water. Properties
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in electrical and radio engineering, a component of an electron or ion device, such as an incandescent lamp, a fluorescent lamp, or an electron tube. The base is used to install the device in, for example, a socket and to provide the connection between the elements within the device, such as the filaments or the electrodes, and the external electric circuit.
ii. In air traffic control phraseology and when transmitted on the radio, it means turning onto the base leg of the circuit pattern. The base leg, as it is known, is flown at right angles to the runway, just before turning to the final direction for landing.
iii. In photogrammetry, the distance at the scale of the stereoscopic model between adjacent perspective centers as reconstructed in the plotting instrument. Also called an air base.
iv. In military radio telephony usage, it means the airfield from which the mission was launched, as in “return to base.”
v. The same as base course.
base(1) A starting or reference point.
(2) In a bipolar transistor, the elements that act as a switch. In NMOS and PMOS transistors, which make up CMOS circuits, the base is called the "gate." See transistor.
(3) A multiplier in a numbering system. In a decimal system, each digit position is worth 10x the position to its right. In binary, each digit position is worth 2x the position to its right.