device that removes something from whatever passes through it
"She installed a new water filter in her kitchen sink to remove sediment and improve the taste of her coffee."
an electrical device that alters the frequency spectrum of signals passing through it
"The audio engineer adjusted the filter to remove the unwanted low-frequency hum from the microphone signal before mixing the track."
A device which separates a suspended, dissolved, or particulate matter from a fluid, solution, or other substance; any device that separates one substance from another.
"She replaced the old kitchen filter to ensure the coffee maker would no longer produce gritty brews."
In plain English: A filter is something that lets certain things pass through while blocking others.
"She added a coffee filter to the machine before brewing her morning cup."
Usage: Use "filter" as a noun to describe a physical object like a coffee filter or air filter that removes unwanted particles from a liquid or gas. Do not use it for the abstract act of selecting information, which should instead be described with verbs like "screen" or "select."
remove by passing through a filter
"filter out the impurities"
To sort, sift, or isolate.
"The app filters out all posts from accounts I don't follow so my feed only shows content I actually care about."
In plain English: To filter something means to let only the good parts through while blocking out the bad stuff.
"She filtered the coffee through a paper cup before serving it."
Usage: Use "filter" to describe removing unwanted elements from a liquid, air, or digital stream by passing it through a medium or applying specific criteria. Do not use this word for simple sorting lists unless the process involves sifting out impurities or isolating specific data points.
The word "filter" comes from the Middle English term filtre, which was borrowed from Medieval Latin and originally referred to a piece of cloth used for straining liquids. It entered English alongside its doublet, "phin," though the spelling eventually settled on the form we use today.