noun
a device or piece of equipment used to remove impurities or unwanted elements from something
verb
to pass (a liquid, gas, light, or sound) through a device to remove unwanted elements
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The laboratory uses a special filter to separate impurities from the liquid solution.
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I always make sure to use a filter when brewing my coffee to get rid of any grounds.
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I need to put on a filter before I post anything on social media.
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It's important to filter out negative thoughts and focus on the positive aspects of life.