noun
the quality of being cautious; care or watchfulness in avoiding danger
verb
to warn, advise, or urge someone to be careful or prudent
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It is important to exercise caution when handling hazardous materials in the laboratory.
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Hey, just a heads up, you might want to use caution when walking on that icy path.
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Dude, I would totally caution you against going to that party, it's going to be a disaster.
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In matters of the heart, it's always wise to proceed with caution and guard your emotions.