EXPANDING definition: 1. present participle of expand 2. to increase in size, number, or importance, or to make something…. Learn more. Definition of 'expanding' expanding in British English (ΙͺkˈspΓ¦ndΙͺΕ‹ ) adjective becoming, or capable of becoming, greater in extent, volume, size, or scope 1. To become greater in size, volume, quantity, or scope: Air expands when heated. This critic's influence is expanding. 2. To speak or write at length or in detail: expand on a favorite topic. 3. To open up or …

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