filtering Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. the process of removing unwanted materials. Example Sentence Filtering is the process of removing impurities or unwanted elements from a substance or a system. More Example Sentences They are filtering the air in the room. Synonyms sifting; screening; purifying Antonyms add; mix Hear It! Say It! Write It! filtering Switch to cursive Start Share with your friends: