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quarter is one fourth, , 25% or 0.25 and may refer to:
- Quarter (urban subdivision), a section or area, usually of a town
- Quarter section, an area of one-fourth of a square mile, or
- Quarter (United States coin), valued at one-fourth of a U.S. dollar
- Quarter (Canadian coin), valued at one-fourth of a Canadian dollar
- Quarter of a calendar year
- Academic quarter (year division), a division of an academic year lasting from 8 to 12 weeks
- Academic quarter (class timing), term used by universities in various European countries for the 15 minutes between the defined start time for a lecture and the actual time it will start
- Fiscal quarter, one fourth (three months) of a fiscal year
- Quarter (unit), various obsolete customary units of measurement
- Quartier (unit), an obsolete French units of measurement