There are 2 main definitions of proof of purchase in English:

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proof of purchase 1

Syllabification: proof of pur·chase

noun

Confirmation in the form of a receipt or other document that one has paid for a particular item: we had to have proof of purchase in order to qualify for service under the warranty you need a proof of purchase otherwise the retailer cannot verify that you purchased the product from their store
More example sentences
  • Keep receipts, cheque stubs, credit card statements or similar proof of purchase.
  • They will accept returns, often without a receipt or other proof of purchase.
  • Remember to keep your proof of purchase - you will need it.

Definition of proof of purchase in:

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There are 2 main definitions of proof of purchase in English:

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proof-of-purchase 2 Syllabification: proof-of-pur·chase

adjective

Designating a feature or symbol on a product that can be removed by the buyer to prove that the product was purchased, in order to claim a rebate or refund.
Example sentences
  • ‘It has recently started to crop up here,’ Danard said of Vancouver's system, which operates on a proof-of-purchase system in which tickets are examined by an inspector.
  • The promo also includes an offer with CompuServe for three months of free Internet service with three proof-of-purchase seals.

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