The process of transfer (or an air mass property) by virtue of motion. In particular the horizontal or vertical components of the motion. The term is, however, often used to signify horizontal transfer only.

In physics, engineering, and earth sciences, advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid`s bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream. Another commonly advected quantity is energy or enthalpy. Here the fluid may be any....

[n] - (meteorology) the horizontal transfer of heat or other atmospheric properties

noun (meteorology) the horizontal transfer of heat or other atmospheric properties
Found on https://www.encyclo.co.uk/local/20974

Advection involves the transfer of heat energy by means of horizontal mass motions through a medium.
Found on http://www.physicalgeography.net/physgeoglos/a.html

horizontal movement of air
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Horizontal movement of air, moisture, or heat.
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Horizontal transport of temperature, pressure, moisture or some other atmospheric attribute solely by the wind.
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in atmospheric science, change in a property of a moving mass of air because the mass moves to a region where the property has a different value ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/a/21

Refers to processes of transport and mixing of properties (energy, heat, moisture, etc.) of a fluid by mass motion of that fluid in the horizontal plane. In the atmosphere, the horizontal transfer of anything by the movement of air, i.e. wind. Common examples of advection include heat and moisture. Contrast with convection.

The horizontal transfer of air mass properties by the velocity field of the atmosphere.

The horizontal transfer of any property in the atmosphere by the movement of air (wind). Examples in
Found on http://www.superglossary.com/Glossary/Science/Weather/

The horizontal transfer of any property in the atmosphere by the movement of air (wind). Examples include heat and moisture advection.
Found on http://www.weather.com/glossary/a.html

The predominately horizontal large-scale movement of air that causes changes in temperature or other physical properties. In oceanography, advection is the horizontal or vertical flow of sea water as a current.
Found on http://cdiac.ornl.gov/glossary.html

The transfer of heat by the horizontal movement of air or water, such as a warm wind or ocean current.
Found on http://www.bbc.co.uk/weather/weatherwise/glossary/a.shtml

The transfer of matter such as water vapour or heat through the atmosphere as a result of horizontal movement of an air mass.