English
tetrad
Tetrad comes from Ancient Greek τετράς ‘the fourth day of the month’, and goes back to Proto-Indo-European *kʷetwóres ‘four’.
- Proto-Indo-Europeanc. 4500–2500 BCE*kʷetwóres‘four’reconstructed
- Ancient Greekc. 800–300 BCEτετράςtetrás‘the fourth day of the month’
- Englishearliest quotation 2010tetrad
attested reconstructed ? uncertain or disputed
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*kʷetwóres‘four’reconstructed
- Ancient Greekc. 800–300 BCEτετράςtetrás‘the fourth day of the month’
- Englishearliest quotation 2010tetrad
Earliest quotation: 2010, Siddhartha Mukherjee, The Emperor of All Maladies: “Religious movements and cults are often founded on a…”
Linked words
through Proto-Indo-European *kʷetwóres ‘four’
fourth, quarry, cater, kern, farthing, carillon, quire, quatre, ferd, cuatro, quatrain, 18 more
Today it means
noun A group of four things.
Language periods are conventional ranges, not dates for this word.
Etymograph / Proto-Indo-European *kʷetwóres / tetrad