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High-Altitude Low-Opening
abbr., astronaut., mil. HALO (parachute jump)
High Altitude, Low Opening
abbr., scottish HALO (parachuting)
High Altitude: 31 phrases in 11 subjects
Astronautics2
Aviation2
Communications1
Earth sciences1
General3
Hobbies and pastimes1
Life sciences1
Medical10
Meteorology2
Technology1
Transport7