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congestion

kuhn-JES-chuhn /kənˈdʒestʃən/

nounB2TOEFLIELTSSAT

generalacademictechnical

The state of being overcrowded or blocked with traffic, people, or fluid.

Describes heavy volume that slows down flow, but unlike gridlock, movement is usually still occurring slowly.

The story behind the word. From Latin congestio, derived from congerere ('to heap up'), composed of com- ('together') and gerere ('to carry'). Originally used in medical Latin for the accumulation of blood or fluid in tissue before being applied to crowded city streets in the 19th century.

Word relationships

overcrowding: 'Overcrowding' focuses on person density in a space, while 'congestion' emphasizes obstructed flow.
jamming: 'Jamming' suggests sudden wedging together rather than built-up density.

clearance: The state of being free from obstruction or crowding.

Commonly confused with

gridlock: 'Congestion' means heavy, slow-moving volume; 'gridlock' means complete stop across an entire network.

Word family

congest (verb): To cause an accumulation of traffic or fluid.
congested (adjective): Overcrowded or blocked.

Collocations

traffic congestion
congestion charge
relieve congestion
heavy congestion

Idioms & expressions

easing congestion (reducing traffic density)

Example sentences

"The mayor introduced congestion pricing to discourage motorists from driving into the downtown core." Municipal traffic policy
"Heavy traffic on the highway was as severe as the nasal congestion he suffered during flu season." Medical / physical blockage

Memory hook

CON (together) + GEST (carried): Too many things carried together into one space. Heaped up into a crawl.

When not to use

Do not use to describe a completely empty or freely moving transit corridor.

Fun facts

London was the first major modern city to implement a formal 'Congestion Charge' in 2003, reducing inner-city traffic by 15% in its first year.