A significantly larger city within a country, representing national culture, economy, and politics, disproportionately dominates all other cities in size and influence. It typically holds a population more than twice as large as the next largest city and serves as the primary hub for various national functions. A common illustration is the overwhelming prominence of London in the United Kingdom, far surpassing other major cities in terms of population and overall significance.
The importance of such a dominant urban center stems from its concentration of resources, opportunities, and power. Historically, these cities often evolved as capitals, consolidating administrative, commercial, and cultural activities. While they can facilitate economic growth and national unity, they can also lead to regional inequalities and an uneven distribution of development. This concentration can strain infrastructure, housing, and social services within the dominant urban area.