The part in the front or nearest the viewer; SYN. head.
ETYM French frant forehead, Latin frons, frontis; perh. akin to Eng. brow.
1. The part of something that is nearest to the normal viewer.
2. The side that is forward or prominent; SYN. front end, forepart.
3. The side that is seen or that goes first.
4. The outward appearance of a person.
5. The atmospheric phenomenon created at the boundary between two different air masses.
6. A sphere of activity involving effort.
In meteorology, the boundary between two air masses of different temperature or humidity. A cold front marks the line of advance of a cold air mass from below, as it displaces a warm air mass; a warm front marks the advance of a warm air mass as it rises up over a cold one. Frontal systems define the weather of the mid-latitudes, where warm tropical air is constantly meeting cold air from the poles.
Warm air, being lighter, tends to rise above the cold; its moisture is carried upward and usually falls as rain or snow, hence the changeable weather conditions at fronts. Fronts are rarely stable and move with the air mass. An occluded front is a composite form, where a cold front catches up with a warm front and merges with it.