four, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
(noun) the cardinal number that is the sum of three and one
Source: WordNet® 3.1
tetrad (plural tetrads)
A group of four things.
Synonyms: foursome, quartet, Thesaurus:quartet
(biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
(biology) A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
(cartography) A unit of land area of two by two (that is, four) square kilometres.
(chemistry) A tetravalent atom or radical.
(mathematics) A group of four basis vectors for a four-dimensional manifold in differential geometry.
• monad · duad, dyad · triad · tetrad · pentad · hexad · heptad · octad · ennead, nonad · decad, decade · hendecad · dodecad, duodecade
• ratted, tarted
Source: Wiktionary
Tet"rad, n. Etym: [L. tetras, -adis, Gr. tétrade.]
1. The number four; a collection of four things; a quaternion.
2. (Chem.)
Definition: A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
Source: Webster’s Unabridged Dictionary 1913 Edition
26 January 2025
(verb) leave undone or leave out; “How could I miss that typo?”; “The workers on the conveyor belt miss one out of ten”
Coffee dates back to the 9th century. Goat herders in Ethiopia noticed their goats seem to be “dancing” after eating berries from a particular shrub. They reported it to the local monastery, and a monk made a drink out of it. The monk found out he felt energized and kept him awake at night. That’s how the first coffee drink was born.
