ex‧pan‧sion W3
1 [uncountable and countable] when something increases in size, range, amount etc [= growth; ↪ expand]
expansion of
The rapid expansion of cities can cause social and economic problems.
expansion in
an expansion in student numbers
2 [uncountable and countable] when a company, business etc becomes larger by opening new shops, factories etc [↪ expand]:
The industry underwent a period of rapid expansion.
3 [countable] an idea, story etc that is based on one that is simpler or more general:
The novel is an expansion of a short story he wrote about forty years ago.

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