What does filtered mean?

filter4d[intransitive] + adv.prep. (of people) to move slowly in a particular directionThe doors opened and people started filtering through. [intransitive] + adv.prep. (of information, news, etc.) to slowlyAs verbs the difference between filtered and filtred is that filtered is past tense of filter while filtred is past tense of filtre. As an adjective filtered is with a filter e.g., a carette.