a particle representing a quantum of light or other electromagnetic radiation - Photon, an instrument on a vehicle's dashboard indicating its speed - speedometer, of an illness) persisting for a long time or constantly recurring - chronic, having or representing the earth as the center - geocentric, the arrangement of events or dates in the order of their occurrence - chronology, relating to geometry - geometric, a photographic copy of printed or written material - photocopy,

Gr. 5- Greek roots

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