Longman Dictionary of Contemporary English homepage

buy

2 noun
     
buy2 [countable, usually singular]
1 something that is worth buying, because it is cheap, good quality, or likely to gain in value
a good/excellent etc buy
The wine is a good buy at $6.50.
It's worth shopping around for the best buy (=what you want at the lowest price).
2 informal an act of buying something, especially something illegal [= deal]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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