a nearly spherical body of gas contained in a liquid.

a small globule of gas in a thin liquid envelope.

a globule of air or gas, or a globular vacuum, contained in a solid.

anything that lacks firmness, substance, or permanence; an illusion or delusion.

an inflated speculation, esp. if fraudulent

The real-estate bubble ruined many investors.

the act or sound of bubbling.

a spherical or nearly spherical canopy or shelter; dome

The bombing plane bristled with machine-gun bubbles. A network of radar bubbles stretches across northern Canada.

a domelike structure, usually of inflated plastic, used to enclose a swimming pool, tennis court, etc.

Informal . a protected, exempt, or unique area, industry, etc.

The oasis is a bubble of green in the middle of the desert.

an area that can be defended, protected, patrolled, etc., or that comes under one's jurisdiction

The carrier fleet's bubble includes the Hawaiian Islands.

a sudden, small, temporary change or divergence from a trend

In May there was a bubble in car sales, with three percent more being sold than last year.

to form, produce, or release bubbles; effervesce.

to flow or spout with a gurgling noise; gurgle.

to boil

The tea bubbled in the pot.

to speak, move, issue forth, or exist in a lively, sparkling manner; exude cheer

The play bubbled with songs and dances.

to seethe or stir, as with excitement

His mind bubbles with plans and schemes.

to cause to bubble; make bubbles in.

Archaic . to cheat; deceive; swindle. ?

bubble over, to become lively

The last time I saw her she was bubbling over with enthusiasm.

adjective

babbling , burbling , gurgling , rippling , carbonated , ebullient , effervescent , effusive , exuberant , fizzy , yeasty

noun

ebulliency , effervescence , effusiveness , exuberance , yeastiness