This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The act of gathering into a heap or mass; accumulation.

n. An excess of traffic.

n. Overfullness of the capillary and other blood vessels, etc., in any locality or organ (often producing other morbid symptoms); local hypermic, active or passive; as, arterial congestion; venous congestion; congestion of the lungs.

n. An excess of mucus or fluid in the respiratory system; congestion of the lungs, or nasal congestion.

n. The act of gathering into a heap or mass; accumulation.

n. Overfullness of the capillary and other blood vessels, etc., in any locality or organ (often producing other morbid symptoms); local hyperæmia, active or passive.

n. The act of gathering or heaping together or forming a mass; an aggregation.

n. An excessive accumulation; an overcrowded condition; specifically, in medicine, an unnatural accumulation of blood in an organ or part; hyperemia: as, congestion of the lungs or of the brain.

n. excessive crowding

n. excessive accumulation of blood or other fluid in a body part

"The term congestion, however, usually indicates a morbid condition, with more or less lasting effects."

crowding   

active congestion   

congestion charge   

accumulation   

digestion    indigestion    ingestion    question    suggestion   

inflammation    pneumonia    abscess    edema    hemorrhage    diarrhea    headache    catarrh    constipation    ulcer