A one
A a


    • US Pronunciation
    • US IPA
    • [ey wuhn]
    • /ˈeɪ ˈwʌn/
    • US Pronunciation
    • US IPA
    • [ey wuhn]
    • /ˈeɪ ˈwʌn/

Definitions of a-1 word

  • adjective a-1 noting a vessel regarded by a shipping-classification society as being equipped to the highest standard and with equipment maintained in first-class condition. 1
  • adjective a-1 Also, A number one. Informal. first-class; excellent; superior: The meals there are A one. 1
  • adjective a-1 excellent, top quality 1
  • noun a-1 (US, military, historical) Cox-Klemin A-1 Air Ambulance, never mass produced. 0
  • noun a-1 (US, military) Skyraider single engine general-purpose attack aircraft. 0
  • noun a-1 (US, military) Personnel section of an air force staff. 0

Information block about the term

Origin of a-1

First appearance:

before 1830
One of the 36% newest English words
First recorded in 1830-40

Historical Comparancy

Parts of speech for A-1


a-1 popularity

A pretty common term. Usually people know it’s meaning, but prefer to use a more spread out synonym. About 54% of English native speakers know the meaning and use word.
This word is included in each student's vocabulary. Most likely there is at least one movie with this word in the title.

Synonyms for a-1

adj a-1

  • great — unusually or comparatively large in size or dimensions: A great fire destroyed nearly half the city.
  • unreal — not real or actual.
  • praiseworthy — deserving of praise; laudable: a praiseworthy motive.
  • valuable — having considerable monetary worth; costing or bringing a high price: a valuable painting; a valuable crop.
  • wonderful — excellent; great; marvelous: We all had a wonderful weekend.

Antonyms for a-1

adj a-1

  • unimportant — of much or great significance or consequence: an important event in world history.
  • unworthy — not worthy; lacking worth or excellence.
  • imperfect — not perfect; lacking completeness: imperfect knowledge.
  • contemptible — If you feel that someone or something is contemptible, you feel strong dislike and disrespect for them.
  • despicable — If you say that a person or action is despicable, you are emphasizing that they are extremely nasty, cruel, or evil.

Top questions with a-1

  • which complex carbohydrate contains only a-1 4-glycosidic linkages?

See also

Matching words

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