Unclaimed things haven't been collected or demanded, like an unclaimed sweatshirt in the lost-and-found bin at school.

When you claim something, you make a formal request for it or assert that you have a right to it, the way you claim your seat at the theater or claim your bag from the baggage carousel at the airport. Bags that left at the airport or seats left empty? Those are unclaimed.

Definitions of unclaimed
  1. adjective
    not claimed or called for by an owner or assignee
    unclaimed luggage”
    not wanted; not needed
Word Family

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