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For example, a newspaper. In general, last week's newspaper is much less relevant than today's. I want to use it in a sentence like: "Since newspapers are ____ in nature, it's important to be notified the moment a new issue comes out." Temporal is the only thing I can think of, but not really since I don't want to emphasize the object's impermanence.

  • ephemeral is the word. – Xanne Dec 3 '17 at 5:22
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When English speakers can't think of a single word for something, they sometimes stick words together to make a phrase. That's the case with time-sensitive, which the Cambridge Dictionary helpfully defines:

time-sensitive adjective UK ​ US ​ ​ used to describe a product that has to be delivered by a particular time, or information that is only useful for a particular period: We deliver high-value, time-sensitive goods like cars, computers and specialist chemicals. time-sensitive documents

The word ephemeral suggested by a commenter conveys the brevity of something's life span, but it fails to deliver an indication of value.

We can raise the stakes on time-sensitive (a newspaper, in the original post) to time-critical (in the case of a shipment of vaccine for an outbreak of gomps in a remote corner of Rumtifoo).

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