Usually means: Auxiliary power unit for aircraft.
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We found 17 dictionaries that define the word APU:

General (8 matching dictionaries)
  1. APU: Merriam-Webster
  2. APU: Oxford Learner's Dictionaries
  3. Apu, apu: Wordnik
  4. APU: Wiktionary
  5. apu: Dictionary.com
  6. APU, Apu (god), Apu (magazine), Apu: Wikipedia, the Free Encyclopedia
  7. APU: Stammtisch Beau Fleuve Acronyms
  8. APU: Merriam-Webster

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)
  1. Travel Industry Dictionary (No longer online)

Computing (1 matching dictionary)
  1. APU: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. APU: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (2 matching dictionaries)
  1. Apu (offensive): Racial Slur Database
  2. A.P.U: Urban Dictionary

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

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Definitions from Wiktionary (APU)

▸ noun:  (aviation) Initialism of auxiliary power unit. [(aviation) A generator in aircraft or other vehicles for providing electric power to various systems, such as lighting, especially when the main engines are not running.]

Similar:
genus apus, Sardar, Vishnu, Purana, jugal, bhai, dhobi, shabash, nanus, Chachi, more...

Types:
gas turbine, diesel, microturbine, fuel cell, hybrid-electric, solar, wind, geothermal, more...

Phrases:
apu mallku, Apu Nahasapeemapetilon, The Problem with Apu, The Apu Trilogy, 155 GH 52 APU, more...

Adjectives:
young, hunhun, much, little, latent, new, raoul, smaller, tehip, honorific

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Similar:
genus apus, Sardar, Vishnu, Purana, jugal, bhai, dhobi, shabash, nanus, Chachi, more...

Types:
gas turbine, diesel, microturbine, fuel cell, hybrid-electric, solar, wind, geothermal, more...

Phrases:
apu mallku, Apu Nahasapeemapetilon, The Problem with Apu, The Apu Trilogy, 155 GH 52 APU, The World of Apu, Apu Biswas, Homer and Apu, Much Apu About Nothing, The Sweetest Apu, more...

Adjectives:
young, hunhun, much, little, latent, new, raoul, smaller, tehip, honorific



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