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tetragamy
tetragamy n. 
/tɛˈtraɡəmi/, /tɛˈtræɡəmi/ a fourth marriage; (also) marriage with four women simultaneously. [After post-classical Latin tetragamia (1545 or earlier) or its etymon Byzantine Greek τετραγαμία.]
Brit. /tᵻˈtraɡəmi/
, /tᵻˈtraɡəmi//tɛˈtraɡəmi/U.S. /təˈtræɡəmi/
, /təˈtræɡəmi//tɛˈtræɡəmi/ΘΚΠ
society > society and the community > kinship or relationship > marriage or wedlock > remarriage > [noun] > more than once
octogamyc1395
trigamy1615
tetragamy1862
society > society and the community > kinship or relationship > marriage or wedlock > types of marriage custom or practice > [noun] > polygamy > state of having four spouses
tetragamy1862
1862 J. C. Robertson Hist. Christian Church II. iv. v. 402 (note) He [Symeon Magister] says that the lawfulness of ‘tetragamy’ was believed to have been revealed to Euthymius.
1907 W. De Morgan Alice-for-Short xviii. 203 Charles had said to his friend, jokingly, that if he had fifty sisters, single ones, Johnson was welcome to make offers to them all round.—‘But then, my dear Paracelsus, that was to be if I had fifty. That would leave me forty-nine—or in case of bigamy, forty-eight; or quadrogamy—tetragamy—whatever it ought to be—forty-six.’
1918 R. A. Knox Spiritual Aeneid x. 166 We could always split the difference between monogamy and tetragamy by having two wives all round.
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