Meaning ofapsisin English

Noun

1. closest or furthest orbital points; perihelion, aphelion
   The planet's apsis is the point where it is closest to the sun.
2. orbital extremes from the sun; apside points
   The architect designed the church with a beautiful apsis at the end of the nave.
3. a church's recessed area (with dome or vault)
   The astronaut studied the apsis of the comet's orbit to predict its trajectory.