long-standing

British  

adjective

1. existing or in effect for a long time

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Example Sentences

"This theoretical breakthrough could turn a long-standing problem into a powerful new tool for advancing quantum technologies."

From Science Daily

With the December 31 deadline looming, concerns focus on what will happen in early 2026 if the NGOs that are selected lack the capacity and expertise of organisations with a long-standing presence.

From Barron's

Mounfield died last month - aged 63 - peacefully in his sleep of "respiratory issues" linked to the long-standing lung condition, emphysema, coroners confirmed to the Manchester Evening News.

From BBC

For astronomers, the long-standing challenge has not just been how to see these objects, but knowing where to search in the first place.

From Science Daily

A new study led by researchers at McGill University is calling into question a long-standing idea about how dopamine influences movement.

From Science Daily