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According to WordNet, the noun "aviation" has 4 sense(s).
108067218 the operation of aircraft to provide transportation.
108433727 the aggregation of a country's military aircraft.
105635188 the art of operating aircraft.
100300441 travel via aircraft; "air travel involves too much waiting in airports"; "if you've time to spare go by air".
Explore the word aviation on the WordNet web site.
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