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aviation

mastery

UK /ˌeɪ̯.viːˈeɪ̯.ʃən/ US /ˌeɪ̯.viˈeɪ̯.ʃən/noun

card 1 of 10 · synonym

Which word is closest in meaning to 'aviation' in this sentence?

The country's aviation was crucial in defending its airspace.