A1

A1
1. noun
a) A standard paper size, defined by ISO 216 to have dimensions: 841 x 594 mm (840.90 x 594.60 mm)

a sheet of A1 paper

b) Under the ("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.
a) In good health.
b) In excellent or top condition.

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