Front

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A front is a boundary or transition zone between two air masses of different density, and thus (usually) of different temperature. A moving front is named according to the advancing air mass, e.g., cold front if colder air is advancing.[1]

In military usage, the term is also used in wartime refer to the geographic area where the bulk of fighting takes place (as opposed to a rear area).

References

  1. http://www.weather.gov/glossary/index.php?letter=f