Englishfor English speakers
natural
Adjective
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Something is natural if people didn't make it.
s, plants and rocks are natural things.
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Something is natural if it's the way it usually is, without people changing it, or is a way that is not a surprise.
It's only natural for you to think that.
functional
Adjective
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If something is functional, it is working properly or normally.
The flashlight was still functional after I dropped it down the stairs.