Circa

Multi tool use | Look up circa in Wiktionary, the free dictionary. |
For other uses, see Circa (disambiguation).
"Ca." and "Cca." redirect here. For other uses of "Ca", see CA. For other uses of "Cca", see CCA.
Circa (from Latin, meaning 'around, about') - frequently abbreviated c., ca., or ca (and less frequently circ. or cca.) – signifies "approximately" in several European languages (and as a loanword in English), usually in reference to a date.[1]Circa is widely used in historical writing when the dates of events are not accurately known.
When used in date ranges, circa is applied before each approximate date, while dates without circa immediately preceding them are generally assumed to be known with certainty.
Example: George Washington years are:
- 1732–1799 or 1732–99: Both years are known precisely.
- c. 1732 – 1799: Only the end year is known accurately; the start year is approximate.
- 1732 – c. 1799: Only the start year is known accurately; the end year is approximate.
- c. 1732 – c. 1799: Both years are approximate.
See also
References
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External links
The dictionary definition of circa at Wiktionary
Media related to Circa at Wikimedia Commons
Chronology
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Key topics | - Archaeology
- Astronomy
- Geology
- History
- Paleontology
- Time
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Calendar eras | - Human Era
- Ab urbe condita
Anno Domini / Common Era
- Anno Mundi
- Byzantine era
- Seleucid era
- Spanish era
- Before Present
- Hijri
- Egyptian
- Sothic cycle
Hindu units of time (Yuga)
Mesoamerican
- Long Count
- Short Count
- Tzolk'in
- Haab'
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Regnal year | - Canon of Kings
- Lists of kings
- Limmu
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Era names | - Chinese
- Japanese
- Korean
- Vietnamese
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Calendars |
Pre-Julian / Julian | - Pre-Julian Roman
- Original Julian
- Proleptic Julian
- Revised Julian
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Gregorian | - Gregorian
- Proleptic Gregorian
- Old Style and New Style dates
- Adoption of the Gregorian calendar
- Dual dating
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Astronomical | - Lunisolar
- Solar
- Lunar
- Astronomical year numbering
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Others | - Chinese sexagenary cycle
- Geologic Calendar
- Hebrew
- Iranian
- Islamic
- ISO week date
Mesoamerican
Winter count (Plains Indians)
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Astronomic time | - Cosmic Calendar
- Ephemeris
- Galactic year
- Metonic cycle
- Milankovitch cycles
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Geologic time |
Concepts | - Deep time
- Geological history of Earth
- Geological time units
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Standards | - Global Standard Stratigraphic Age (GSSA)
- Global Boundary Stratotype Section and Point (GSSP)
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Methods | - Chronostratigraphy
- Geochronology
- Isotope geochemistry
- Law of superposition
- Luminescence dating
- Samarium–neodymium dating
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Chronological dating |
Absolute dating | - Amino acid racemisation
- Archaeomagnetic dating
- Dendrochronology
- Ice core
- Incremental dating
- Lichenometry
- Paleomagnetism
Radiometric dating
- Radiocarbon
- Uranium–lead
- Potassium–argon
- Tephrochronology
- Luminescence dating
- Thermoluminescence dating
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Relative dating | - Fluorine absorption
- Nitrogen dating
- Obsidian hydration
- Seriation
- Stratigraphy
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Genetic methods | |
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Linguistic methods | |
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Related topics | - Chronicle
- New Chronology
- Periodization
- Synchronoptic view
- Timeline
- Year zero
- Circa
- Floruit
- Terminus post quem
- ASPRO chronology
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Portal
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