In a manner that doesn't occur at the same time; in a way that doesn't require waiting for other events to complete.
Derived from asynchronous by adding the adverbial suffix '-ly.' The term became essential in computing vocabulary when describing how modern programs handle multiple tasks independently.
Websites load asynchronously—while you're reading at the top of the page, the bottom is still loading images and data in the background, which is why you sometimes see placeholder boxes that suddenly fill in with pictures!
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