A1

adj, noun, slang

adj, noun, slang ·Moderate ·College level

Definitions

Noun
  1. 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 called an 0-2-2.
  2. 2
    Paper size, 594 x 841 mm. wordnet
Adjective
  1. 1
    first rate or excellent not-comparable
  2. 2
    In good health. informal, not-comparable
  3. 3
    in first class condition not-comparable
  4. 4
    In excellent or top condition. informal, not-comparable
  5. 5
    First-class. (Compare A 2 and A 3, which are inferior grades.) not-comparable

Etymology

Etymology 1

The symbol used for a first-class vessel in Lloyd's Register of Shipping.

Etymology 2

From various rating systems, as that of Lloyd's of London or the condition of insured ships. First attested in 1837.

Related phrases

driving wheelfirst classleading wheelsteam locomotivetrailing wheel

More for "a1"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.