Aviation Dictionary

On this page you will find a searchable and comprehensive alphabetical list of aviation terms. You can help us make it the most comprehensive list in the world. If we have missed anything, click on the ‘send us your word’ button to send us your word, acronym or definition and we will consider adding it to our dictionary.

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Imaginary lines placed vertically on the earth which are used as position coordinates, expressed in degrees, minutes and seconds. The datum is at the Greenwich Meridian, which is in England and is at 0 degrees. From there, we can move 180 degrees East and West. All lines of longitude pass through the North and South pole. Lines of longitude are perpendicular (90 degrees) to the equator

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