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High-altitude platform station

high-altitude aerial vehicle which maintains a relatively fixed position over the Earth

Pronunciation
/haɪ - ˈæltəˌtjud ˈplætfɔrm ˈsteɪʃən/
/hʌɪ - ˈaltɪtjuːd ˈplatfɔːm ˈsteɪʃən/