1. A thin, usually spherical or hemispherical film of liquid filled with air or gas: a soap bubble. 2.

A globular body of air or gas formed within a liquid: air bubbles rising to the surface. 3. A pocket formed in a solid by air or gas that is trapped, as during cooling or hardening.

4. 1. The act or process of forming bubbles.

2. A sound made by or as if by the forming and bursting of bubbles. 5.

Something insubstantial, groundless, or ephemeral, especially: 1. A fantastic or impracticable idea or belief; an illusion: didn't want to burst the new volunteers' bubble. 2.

A speculative scheme that comes to nothing: lost money in the real estate bubble. 6. Something light or effervescent: "Macon-though terribly distressed-had to fight down a bubble of laughter" (Anne Tyler).

7. A usually transparent glass or plastic dome. 8.

A protective, often isolating envelope or cover: "The Secret Service will talk of tightening protection, but no President wants to live in a bubble" (Anthony Lewis).

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