a1

adj 5noun 1

Definitions

adj

1

first rate or excellent

2

in first class condition

adj

1

In good health.

2

In excellent or top condition.

3

First-class. (Compare A 2 and A 3, which are inferior grades.)

noun

1

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 cal

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