Synonyms and Antonyms for air-transportation-system

4. system (n.)

(physical chemistry) a sample of matter in which substances in different phases are in equilibrium

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7. system (n.)

a procedure or process for obtaining an objective

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9. air (n.)

the region above the ground

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10. air (n.)

a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of

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