0 the act of passing a liquid or gas through a piece of equipment in order to remove solid pieces or other substances:
The technology exists to remove all of these contaminants through filtration.
1 the process of using a filter to remove solids from liquids or gasses
2 the act of passing a liquid or gas through a filter
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.