syzygy

noun7

1. •
   An alignment of three celestial bodies (for example, the Sun, Earth, and Moon) such that one body is directly between the other two, such as occurs at an eclipse.

   • The duration of an eclipse depends on the relative positions of the sun, moon, and earth in their syzygy. — 1991
2. •
   An archetypal pairing of contrasexual opposites, symbolizing the communication of the conscious and unconscious minds.
3. •
   Complementary female–male pairings of the emanations known as Aeons.
4. •
   The pairing of chromosomes in meiosis.
5. •
   A relation between generators of a module.

   • A finitely presented module is an A-module M given by a finite number of generators and relations. Therefore it is a module with a finite generator set having a finitely generated syzygy module. — 2015
6. •
   The association of two protozoa end-to-end or laterally for the purpose of asexual exchange of genetic material.

   • When two or more arm-joints meet transversely by a rigid suture, and only the upper one is pinnule-bearing, those joints form a syzygy, whether their apposed faces are striated, dotted, or smooth. — 1900
7. •
   The fusion of some or all of the organs.