BharatNotes Megacity
nounUsage in a UPSC answer
The unchecked growth of India's megacities, where glittering financial districts abut sprawling informal settlements, has made the provision of basic urban services and the mitigation of climate vulnerability one of the defining governance challenges of the twenty-first century.
Synonyms
Antonyms
Word Family
megacity (n), megacities (n pl), mega- (prefix), megalopolis (n), megapolitan (adj)
Root
Greek megas (μέγας) = great, large; mega- prefix; Latin civitas = community of citizens (via Old French cite)
Etymology
The prefix mega- from Greek megas (μέγας, "great, large") combined with city from Old French cite, from Latin civitas ("community of citizens"); the term gained currency in the 1970s–80s as cities like Tokyo, New York, and Mexico City crossed the 10-million threshold.
Memory Hook
Break it as MEGA + CITY: "mega" means giant (think megabyte, megaphone), so a megacity is simply a giant-sized city of millions.
How This Word Works in UPSC Writing
An urban area of 10 million or more inhabitants. The count has risen from 8 in 1975 to 33 in 2025, of which 19 are in Asia, and is projected to reach 37 by 2050 (UN World Urbanization Prospects 2025). The examinable difficulty is that the 2025 edition rebuilt its method, adopting the Degree of Urbanization, a harmonised geospatial approach, and lowering the threshold for a city from 300,000 to 50,000 inhabitants, so its figures are not comparable with the 2018 edition's. On the new basis Jakarta is the world's most populous city at nearly 42 million, followed by Dhaka at almost 40 million and Tokyo at 33 million, with Delhi at 30.2 million, and 45 per cent of the world's 8.2 billion people live in cities. Anyone answering from the older edition, where Tokyo led and the urban share read above half, is not wrong about the world but is using a different definition of a city. The report's quieter finding cuts against the megacity focus altogether: 96 per cent of cities hold fewer than one million people, and small and medium cities are growing faster than the giants.
Don’t Confuse It With
A megacity is a size class of 10 million or more, not a unit of administration, so no mayor governs one as such. A metropolis is a single dominant city with its hinterland. A conurbation is a continuous built-up region formed when neighbouring towns merge, and a megalopolis a chain of merged metropolitan areas. An urban agglomeration is the Census of India's unit, a town with its outgrowths. Note also that megacity counts differ between UN editions because the definition of a city changed, not only because populations grew.
Hindi Meaning
महानगर (mahānagar), the same word that also does duty for 'metropolis'; नगरीकरण (nagarīkaran) for urbanisation.
Common Questions
- How many megacities are there?
- Thirty-three in 2025, up from eight in 1975, with nineteen of them in Asia and thirty-seven projected by 2050 (UN World Urbanization Prospects 2025).
- Why do UN megacity figures differ between reports?
- The 2025 edition adopted a geospatial Degree of Urbanization method and lowered the threshold for a city from 300,000 to 50,000 inhabitants, so its city populations, rankings and urban share are not comparable with the 2018 edition's.
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