• WordNet 3.6
    • n ion a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
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Webster's Revised Unabridged Dictionary
    • Ion (Elec. Chem) an atom or goup of atoms (radical) carrying an electrical charge. It is contrasted with neutral atoms or molecules, and free radicals. Certain compounds, such as sodium chloride, are composed of complementary ions in the solid (crystalline) as well as in solution. Others, notably acids such as hydrogen chloride, may occur as neutral molecules in the pure liquid or gas forms, and ionize almost completely in dilute aqueous solutions. In solutions (as in water) ions are frequently bound non-covalently with the molecules of solvent, and in that case are said to be solvated. According to the electrolytic dissociation theory, the molecules of electrolytes are divided into ions by water and other solvents. An ion consists of one or more atoms and carries one unit charges of electricity, 3.4 x 10-10 electrostatic units, or a multiple of this. Those which are positively electrified (hydrogen and the metals) are called cations; negative ions (hydroxyl and acidic atoms or groups) are called anions.
    • Ion One of the small electrified particles into which the molecules of a gas are broken up under the action of the electric current, of ultraviolet and certain other rays, and of high temperatures. To the properties and behavior of ions the phenomena of the electric discharge through rarefied gases and many other important effects are ascribed. At low pressures the negative ions appear to be electrons; the positive ions, atoms minus an electron. At ordinary pressures each ion seems to include also a number of attached molecules. Ions may be formed in a gas in various ways.
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Century Dictionary and Cyclopedia
    • n ion One of the elements of an electrolyte, or compound body undergoing electrolyzation. Those elements of an electrolyte which are evolved at the anode are termed anions, and those which are evolved at the cathode cations, and when these are spoken of together they are called ions. Thus, water when electrolyzed evolves two ions, oxygen and hydrogen, the former being an anion, the latter a cation.
    • n ion A suffix in abstract nouns (many also used as concrete) of Latin origin, as in legion, opinion, option, region, religion, suspicion, communion, union, etc.
    • n ion A similar suffix occurring in a few concrete nouns designating persons or things, as in centurion, histrion, union (a pearl), onion, pavilion, etc.
    • n ion An abbreviation of longitude.
    • n ion In physical chemistry, one of the particles, bearing electric charges, which carry electric currents through the air or other gas. See electron, 2.
    • n ion In physical chemistry, the word ion added, as a suffix, to the abbreviated name of an atom or radical to form a name for the atom or radical in the ionic state: thus chlorion means an atom of chlorin in the ionic condition; cuproion or cupriion, the ion of univalent and of bivalent copper.
    • n ion An abbreviation of Ionic.
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Chambers's Twentieth Century Dictionary
    • n Ion ī′on one of the components into which an electrolyte is broken up on electrolysis—the Anion, the electro-negative component, chemically attacking the anode, and the Cation, the electro-positive component, the cathode.
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Webster's Revised Unabridged Dictionary
Gr. 'io`n, neut, of 'iw`n, p. pr. of 'ie`nai to go
Chambers's Twentieth Century Dictionary
Gr. iōn, pr.p. of ienai, to go.


In literature:

Glaucus paced swiftly up the perilous and fearful streets, having learned that Ione was yet in the house of Arbaces.
"Standard Selections" by Various
For a bor-der, I'd like small on-ions.
"Pages for Laughing Eyes" by Unknown
Babel Ions, of Philadelphia, was his bosom friend.
"The Dismal Swamp and Lake Drummond, Early recollections" by Robert Arnold
If the solute dissociates into ions, the reason for this becomes clear.
"An Elementary Study of Chemistry" by William McPherson
It has atomic engines, but no blasts or ion-plates ... but neither has this one!
"The Galaxy Primes" by Edward Elmer Smith
I have to-day heard that he has been appointed to the `Ione.
"Ned Garth" by W. H. G. Kingston
Ion Keith-Falconer, Orientalist and missionary, was a saint in boyhood as in manhood.
"Fifteen Chapters of Autobiography" by George William Erskine Russell
Ion's suspicions at once fell upon the obsequious servant of Creusa, who with such officious attention had filled his cup.
"Myths and Legends of Ancient Greece and Rome" by E.M. Berens
Natatorial -ions: formed for swimming.
"Explanation of Terms Used in Entomology" by John. B. Smith
Landing a ship on her jets isn't an easy job, but at least an ion rocket is built for the job.
"Unwise Child" by Gordon Randall Garrett

In poetry:

Innumerable ions of light,
Kindling, irradiating,
All to their foci tending…
"Broadway" by Lola Ridge
Was it a dim-remembered dream?
Or glimpse through ions old?
The secret which the mountains kept
The river never told.
"A Mystery" by John Greenleaf Whittier

In news:

I recently purchased a DeWalt 18-volt cordless tool with lithium-ion batteries and noticed that the new batteries also fit my old DeWalt tools.
A new DNA sequencing machine from Ion Torrent, a unit of Life Technologies Corporation, makes it possible to analyze a person's entire genome in just one day for $1,000.
Topaz is routinely modified commercially from clear to blue through ion beam sterilization, though at greater energy levels than those proposed for sanitizing the mail.
Ion, Dish, Hallmark, others to carry spots, says PTC.
Bosch Power Tools reported that it has sold more than 1 million Isio shrub and grass shear, in part, due to the lithium-ion technology that the outdoor power tool uses.
Saturn keeps Ion entry level.
Purolite's softening calculator is a simple-to-use tool requiring the minimum of inputs to estimate ion exchange resin requirements to soften water, and can be found on
The steeple of the Otsego United Methodist Church ion the 200 block of East Allegan Street in Otsego was replaced Monday after being removed Aug 28 for rebuilding.
Heavy ion collisions at CERN should be able to produce the shortest light pulses ever created.
A simulation of a lead ion collision in the ALICE experiment at CERN in Geneva, Switzerland.
The ion exchangers cannot tell water made with tritium from any other water, nor can they remove it.
Before Ion Tiriac answers to the players at the annual Wimbledon meeting of the ATP rank-and-file about that blue clay he introduced in Madrid, he has to answer to me.
The Dec 27 forum is being hosted by the conservative Web site Newsmax and broadcast on Ion Television.
Check out the latest features in ETC's version v1.8 software for the Eos® family (Eos, Ion®, and Element™) of control products, as presented by product manager Anne Valentino.
Mark Quiner joins Ion .

In science:

The entropy variat ion is due to the variat ion of the number of microstates.
The Energy-Entropy Principle
In this set-up an ion is confined in a RadioFrequency ion trap (see [45, 46] for an overview on the ion trap quantum computer).
Quantum random walks - an introductory overview
It also contains tritium, hydrogenlike ions of almost all elements (and other few-electron ions).
Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
A study of the g factor of a bound electron in a medium-Z hydrogen-like ion with a spinless nucleus offers a comparison of the electron spin precession frequency affected by QED effects and the ion cyclotron frequency.
Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
As the molecular ions decouple from the lattice, the tendency to behave as isolated ions gets stronger and thus the possibility of D3d /D5d distortions increases.
Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A4C60 (A = K, Rb, Cs)