1. a device or material that removes unwanted substances or particles from a liquid or gas passing through it
2. a program or tool that blocks or allows certain data, content, or communications based on set criteria
Usage: computing
3. a colored glass or transparent material placed over a light source or camera lens to modify the light
Usage: photography; lighting

1. to pass a liquid or gas through a filter to remove unwanted substances
2. to remove or block unwanted items, data, or content using a filter or selection process
Usage: computing

Examples

• The coffee filters keep the grounds out of your cup.
• She changed the air filter in her car to improve engine performance.
• The email system filters out spam messages automatically.
• Photographers use colored filters to change the mood of their photos.
• The water filter removes chlorine and impurities from tap water.
• You can filter the search results by date or price.
• The aquarium filter keeps the water clean for the fish.