Definition of A1
1 : having the highest possible classification —used of a ship
2 : of the finest quality : first-rate
Examples of a1 in a sentence
The car's in A1 condition.
<an A1 mom deserves only the very best Mother's Day card>
First Known Use of a1
A1 Defined for English Language Learners
Definition of A1 for English Language Learners
: very good or excellent
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Thesaurus: All synonyms and antonyms for A1
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