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1. (n.) apsis
either of the two points farthest or nearest the center of attraction in an eccentric astronomical orbit.
Etymology: (1595–1605; < L < Gk hapsís (felloe of) a wheel, arch, vault, orig., fastening, der. (of háptein to fasten)
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| Definition of 'apsis' |
Princeton's WordNet |
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1. (noun) apse, apsis
a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
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| Definition of 'apsis' |
Webster Dictionary |
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1. (noun) apsis
one of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides
2. (noun) apsis
in a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum
3. (noun) apsis
same as Apse
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Definitions of apsis 
