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Radio Altimeter [‘reɪdɪau 'æltɪ,mi:tə]
abbr., scottish	RA
radio altimeter [‘reɪdɪau 'æltɪ,mi:tə]
avia., Canada	Radionavigation equipment on board an aircraft that makes use of the reflection of radio waves from the ground to determine the height of the aircraft above the surface of the earth. • abbreviations: RA and RADALT

Radio: 10 phrases in 5 subjects

Abbreviation	6
Computers	1
Nautical	1
Stock Exchange	1
Technology	1