Syzygy

Syzygy (pronounced siz-i-jee)

(1) In astronomy (actually borrowed from astrology!), the descriptor for either of the two positions (conjunction or opposition) of a celestial body when sun, earth, and the body lie in a straight line (since applied to the "straight-line configuration" of firstly three and later any number of celestial bodies in a gravitational system.

(2) Any two related things, either alike or opposite (obsolete except for historic references).

(3) In classical prosody, a group or combination of two feet, sometimes restricted to a combination of two feet of different kinds.

(4) In biology (especially zoology), the aggregation in a mass of certain protozoans, especially when occurring before sexual reproduction but can be used also when describing the asexual exchange of genetic material.

(5) In psychology, an archetypal pairing of contra-sexual opposites, symbolizing the communication of the conscious and unconscious minds.

(6) In mathematics, a relation between generators of a module.

(7) In medical pathology, a fusing of some or all of the organs.

(8) In genetics, the pairing of chromosomes in meiosis

1650-1660:  From the Late Latin sȳzygia (conjunction), from the Ancient Greek συζυγία (suzugía) (yoke of animals, pair, union of two, conjunction), from syzygein (to yoke together), the construct being an assimilated form of syn- (together) + zygon (yoke), from the primitive Indo-European root yeug- (to join).  In the Greek, the word produced also zeugnýnai (to yoke together), sometimes simplified in English transcription as synzugon.  In English, syzygy was adopted by astronomy in 1847.  In science there are a number of terms of classification based on syzygy, the most attractive of which is probably Syzygium samarangense (a taxonomic species within the family Myrtaceae (wax apple or Javan rose apple).  

In progress.

Syzygy was one of those words from the once respectable field of astrology later adopted by a number of scientific disciplines (astronomy, genetics, psychiatry, mathematics, zoology) and retained, even after astrology became widely regarded as disreputable.  In mathematics and the physical sciences, it was a handy descriptor of things which became paired or, however briefly, were in alignment although historically the emphasis was on "pair", a syzygy as able to be applied to an identical pair as two diametric opposites.  That permissiveness is now listed by most dictionaries as obsolete but is something to be noted when reading historic texts.

The origin of the application of the word in disciplines like psychiatry and psychology (noted more by its appearance in literary works than professional or academic papers) is thought by some to have been triggered by Russian philosopher Vladimir Solovyova (1853–1900) who used syzygy to denote “close union” and applied the concept in a variety of ways which influenced Russian writers not only in the nineteenth century but also those of the symbolist and neo-idealist movements of the later Soviet era and some critics agree Solovyov was at least one of the sources for Fyodor Dostoevsky's (1821–1881) characters Alyosha and Ivan Karamazov in The Brothers Karamazov (1880).  Very much in the tradition of   More controversial is the idea his book, The Meaning of Love (1892) (in which syzygy was introduced) is one of the philosophical sources of Leo Tolstoy's (1828-1910) much discussed The Kreutzer Sonata (1889); critics remain divided and opinions are argued with vigour although unusually united was the critical industry built around Carl Jung (1875–1961) and Sigmund Freud (1856-1939) (particularly the former's theories of the collective unconscious and the balancing of conscious and unconscious elements within an individual's psyche, although this was metaphorical and abstract compared to the use in astronomy and other sciences) which found strands of syzygy in the many themes of the self which so permeates their work.  Given the overarching concepts of (1) the individuation process and (2) the unions of individuals, especially of male and female tending to a totality, even a unity, it’s a word with some appeal to those who seem to value having something with such a range of adaptable meanings to use in works of speculative vagueness.