a1
Meanings
adj
- first rate or excellent
- in first class condition
adj
- In good health.
- In excellent or top condition.
- First-class. (Compare A 2 and A 3, which are inferior grades.)
noun
- Under the International Union of Railways (French: Union internationale des chemins de fer, UIC) classification system, a steam locomotive that has two coupled driving wheels followed by two trailing wheels, with no leading wheels; also called an 0-2-2.
Word forms
Etymology
The symbol used for a first-class vessel in Lloyd's Register of Shipping.
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