The forward parts or faces of objects; in meteorology, boundaries between different air masses; or facades that conceal true purposes.
From Latin frons meaning 'forehead' or 'front part.' The meteorological sense developed in the early 20th century with advances in weather science, while the 'facade' meaning emerged from military terminology.
Weather fronts create most dramatic weather changes - when warm and cold air masses collide along these invisible boundaries, they generate everything from gentle rain to violent thunderstorms. The military borrowed this term because battle lines function similarly as zones of conflict between opposing forces.
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