bubble

What is the Definition of bubble?

Noun:

1. a hollow globule of gas (e.g., air or carbon dioxide)
2. a speculative scheme that depends on unstable factors that the planner cannot control
3. an impracticable and illusory idea
4. a dome-shaped covering made of transparent glass or plastic

Verb:

1. form, produce, or emit bubbles
2. flow in an irregular current with a bubbling noise
3. rise in bubbles or as if in bubbles
4. cause to form bubbles
5. expel gas from the stomach

Other meanings of bubble (synonyms, cognates).