Rapidly means in a very fast or quick way. It often describes actions, changes, or movements that happen over a short time.
It is formed from the adjective “rapid” plus the adverb-forming suffix “-ly.” “Rapid” itself comes from Latin “rapidus,” meaning “swift” or “rushing.”
Adding “-ly” to “rapid” doesn’t just change the grammar; it shifts the focus from what something is (fast) to how it happens (fast). This tiny ending is one of English’s most powerful tools for turning qualities into ways of doing things.
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