(Cricket, countable) An event whereby a batsman hits a ball which bounces on the ground before passing over a boundary in the air, resulting in an award of 4 runs for the batting team. If the ball does not bounce before passing over the boundary, a six is awarded instead.

A group of four cells, as of spores or pollen grains, formed from a parent cell by meiosis. As part of the process of spermatogenesis, a spermatocyte divides into a tetrad of four spermatids, cells which go on to develop into sperm.

Find another word for quaternion. In this page you can discover 22 synonyms, antonyms, idiomatic expressions, and related words for quaternion, like: four, 4, iv, tetrad, quatern, quaternary, quaternity, quartet, quadruplet, foursome and little-joe.

A quaternion is best defined as a symbol of the type q = Za s e s = aoeo + ales = ale, + a3e3, where eo, ...

Thus every quaternion may be written in the form q = Sq+Vq, where either Sq or Vq may separately vanish; so that ordinary algebraic quantities (or scalars, as we shall call them) and pure vectors may each be regarded as special cases of quaternions.

The equations q'+x = q and y+q' = q are satisfied by the same quaternion, which is denoted by q - q'.

In the applications of the calculus the co-ordinates of a quaternion are usually assumed to be numerical; when they are complex, the quaternion is further distinguished by Hamilton as a biquaternion.

The outer and inner products of two extensive quantities A, B, are in many ways analogous to the quaternion symbols Vab and Sab respectively.