"aviations" in the noun sense
1. aviation, air power
the aggregation of a country's military aircraft
the operation of aircraft to provide transportation
3. aviation, airmanship
the art of operating aircraft
4. air travel, aviation, air
travel via aircraft
"air travel involves too much waiting in airports"
"if you've time to spare go by air"
Source: WordNet® (An amazing lexical database of English)
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