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- Void (astronomy), the spaces between galaxy filaments that contain no galaxies
- Void (composites), a pore that remains unoccupied in a composite material
- Void, synonym for vacuum, a space containing no matter
- Void, a bubble within a mechanical part that causes cavitation when it collapses
- Void, an unwanted air pocket formed during injection moulding
- VoID or Vocabulary of Interlinked Datasets, an RDF vocabulary to enable the discovery and use of linked data sets
- Void coefficient, the change in the reactivity of a nuclear reactor when voids form in moderator or coolant fluids
- Void Linux, a Linux distribution
- Void ratio, the volume of void-space to solid space in a material
- Void safety, in object-oriented programming, a guarantee that no object references will have null values
- Void type, in programming languages, a keyword indicating the absence of data
- Void set or empty set, the mathematical set with no elements
