Definition from Wiktionary, the free dictionary
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extent (plural extents)
- A range of values or locations.
- The space, area, volume, etc., to which something extends.
- The extent of his knowledge of the language is a few scattered words.
- (computing) A contiguous area of storage in a file system.
range of values or locations
space, area, volume to which something extends
(computing) individual area of storage
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See also 
- third-person plural present active subjunctive of extō