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Noun: apocentre  'a-pow,sen-tu(r)
Usage: Brit, Cdn (US: apocenter)
  1. (astronomy) the point in the orbit of one body of a binary system at which it is farthest from the centre of mass of the system
    "The satellite reached its apocentre and began to slow down";
    - apocenter [US]

Derived forms: apocentres

Encyclopedia: Apocentre