Two dice, each of which, when thrown, has the same number of spots on the face lying uppermost; as, to throw doublets.
One of two or more words in the same language derived by different courses from the same original from; as, crypt and grot are doublets; also, guard and ward; yard and garden; abridge and abbreviate, etc.
The electronic state of a molecule having one unpaired spin is termed a doublet (see radical). This term is derived from spectroscopy: an unpaired spin can be either up or down with respect to a magnetic field, and these states have different energy, resulting in field-dependent pairs, or doublets, of spectral lines. (See triplet, singlet.)
1) One of a pair of words from the same source which enter the language by different routes (such as capital and capitol), having different spellings and different but related meanings. When the common element of sense is strong and the spellings are very similar, doublets are frequently confused.(Printing) A word or other part that is unintentionally duplicated.
A domino with both ends having the same value. For example, two sixes is called "doublet six" or "six doublet". Also referred to as a "double".
A lens or eyepiece made of two pieces of glass (or other materials) selected so as to reduce the chromatic aberration of the lens.
a set of two words or constructs that have no significant difference of meaning in context
a type of lens made up of two lenses with different refractive indices attached together
a type of lens, made up of two stacked layers with different refractive indices
Two words in the same language that were both borrowed from the same root word in a different language, but at different times, so that their phonological and semantic forms represent the changes the word underwent in the intervening time; for example, the English words "shirt" and "skirt" were borrowed at different times from the same Danish word.
A pair of words which share a common origin, but which have distinct shades of meaning. The words vibrate and vibrant are both derived from the Latin word vibrare, 'to vibrate, shake', but whereas vibrate means 'to shake; quiver', vibrant means 'vigorous, energetic, radiant'.
a closely spaced pair of lenses an achromatic (q.v.) lens of two components made of different types of glass (flint and crown glass : q.v.). They are close together and may be separated either by air or a thin layer of oil. A triplet has three components instead of a doublets two.
If a bell is not round, individual partials can split into a close pair of frequencies which beat together. Doublets can add antique charm to a bell's sound but are usually to be avoided.
A pair: cualidad and calidad is a doublet development (see also under learned).
(noun) Two words in the same language which derive from a common source, eg. clerk and cleric.
Two peaks or bands of about equal intensity appearing close together on a spectrogram.
In optics, a doublet is a type of lens made up of two simple lenses attached together. The lenses are made from glasses with different refractive indices and different amounts of dispersion. This combination produces a better image than a simple lens.
In etymology, two or more words in the same language are called doublets or etymological twins (or possibly triplets, etc.) when they have the same etymological root but have entered the language through different routes. Because the relationship between words that have the same root and the same meaning is fairly obvious, the term is mostly used to characterize pairs of words that have diverged in meaning, at times making their shared root a point of irony.
In quantum mechanics, a doublet is a quantum state of a system with a spin of 1/2, such that there are two allowed values of the spin component, -1/2 and +1/2. Quantum systems with two possible states are sometimes called two-level systems. Essentially all occurrences of doublets in nature arise from rotational symmetry; spin 1/2 is associated with the fundamental representation of the Lie group SU(2), the group that defines rotational symmetry in three-dimensional space.