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bubble. 1  a nearly spherical body of gas contained in a liquid. 2  a small globule of gas in a thin liquid envelope. 3  a globule of air or gas, or a globular vacuum, contained in a solid. 4  anything that lacks firmness, substance, or permanence; an illusion or delusion.
economic bubble. A surge in the market caused by speculation regarding a commodity which results in an explosion of activity in that market segment causing vastly overinflated prices. The prices are not sustainable and the bubble is usually followed by a crash in prices in the affected sector.