Master the word " CONGESTION " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Congestion What does " Congestion " mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term. Congestion means overcrowding, clogging, or accumulation of fluid or mucus in a vessel or organ. Find synonyms, translations, and usage examples of congestion in different contexts. Congestion is the state of being crowded and full of traffic or the state of part of the body being blocked with blood or mucus. Learn how to use this word in different contexts and find synonyms and related words.