"Wind" in this case refers to air in natural motion. It's caused by a difference in air pressure, so when air moves from one area to another, wind happens. I'll bet there's something else that causes wind.
*Giggle*
But there are so many words to describe the characteristics of wind!
A "breeze" is a light wind. In meteorology (which is the study of weather, not meteors) it's defined as a wind ranging from 4-31 MPH. This seems like way to broad a scope, since I imagine a 4 MPH wind ruffles your hair and a 31 MPH wind would probably throw a small dog into the air [citation needed]. You can also use words like "gust", "waft" and "zephyr" in its place.
"Gale" is defined as "a very strong wind". It also has the specialized meteorological definition "a wind of 32-64 MPH", which is probably ranges from dog-tossing (is that a euphamism?) to hatchback-tossing. It has the fun synonyms "squall" and "tempest".
A bit of a specialized word, but nonetheless relevant, is "chinook". It's a warm, dry, periodic wind that blows down the eastern side of the Rockies. I have no idea how you use this word in a sentence, but I thought it was worth mentioning. On the subject of really specific wind definitons, there's also "mistral", which is a northerly wind in France.
Or a northerly wind in your pants!
Image credit ilovebutter
