Definition from Wiktionary, the free dictionary
Alternative forms 
- (US) barycenter
- Rhymes: -ɛntə(ɹ)
barycentre (plural barycentres)
- (mathematics, physics, astronomy) The point at the centre of a system; an average point, weighted according to mass or other attribute. The term is usually used in astronomy for the centre of mass about which a system rotates, for example, the moon and the earth rotate about a common point within the earth but not near the centre. Jupiter and the Sun rotate about a common point just outside the surface of the Sun.
See also 
barycentre m (plural barycentres)