ballooning

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ballooning /bəˈluːnɪŋ/ noun
ballooning
/bəˈluːnɪŋ/
noun
Learner's definition of BALLOONING
[noncount]
: the activity or sport of riding in a hot air balloon

— balloonist

/bəˈluːnɪst/ noun, plural balloonists [count]