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Favoring fundamental change, or change at the root cause of a matter.

Ionnoun

An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.

Pertaining to a root of a plant.

Ionnoun

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.

Pertaining to the basic or intrinsic nature of something.

Ionnoun

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.

Thoroughgoing; far-reaching.

‘The spread of the cancer required radical surgery, and the entire organ was removed.’;

Ionnoun

a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons

Of or pertaining to the root of a word.

Ion

An ion () is a particle, atom or molecule with a net electrical charge. The charge of the electron is considered negative by convention.

Produced using the root of the tongue.

(math) Relating to a radix or mathematical root.

Excellent; awesome.

(historical: 19th-century Britain) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).

(historical: early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.

(arithmetic) A root (of a number or quantity).

(linguistics) In logographic writing systems such as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to phonetic.

(linguistics) In Semitic languages, any one of the set of consonants (typically three) that make up a root.

(chemistry) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.

Given an ideal I in a commutative ring R, another ideal, denoted Rad(I) or $\sqrt\left\{I\right\}$, such that an element x ∈ R is in Rad(I) if, for some positive integer n, xn ∈ I; equivalently, the intersection of all prime ideals containing I.

Given a ring R, an ideal containing elements of R that share a property considered, in some sense, "not good".

The intersection of maximal submodules of a given module.

(number theory) The product of the distinct prime factors of a given positive integer.

Of or pertaining to the root; proceeding directly from the root.

Hence: Of or pertaining to the root or origin; reaching to the center, to the foundation, to the ultimate sources, to the principles, or the like; original; fundamental; thorough-going; unsparing; extreme; as, radical evils; radical reform; a radical party.

‘The most determined exertions of that authority, against them, only showed their radical independence.’;

Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.

Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.

Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.

A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.

‘The words we at present make use of, and understand only by common agreement, assume a new air and life in the understanding, when you trace them to their radicals, where you find every word strongly stamped with nature; full of energy, meaning, character, painting, and poetry.’;

One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; - opposed to conservative.

‘In politics they [the Independents] were, to use the phrase of their own time, "Root-and-Branch men," or, to use the kindred phrase of our own, Radicals.’;

A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom.

‘As a general rule, the metallic atoms are basic radicals, while the nonmetallic atoms are acid radicals.’;

Specifically, a group of two or more atoms, not completely saturated, which are so linked that their union implies certain properties, and are conveniently regarded as playing the part of a single atom; a residue; - called also a compound radical. Cf. Residue.

‘An indicated root of a perfect power of the degree indicated is not a radical but a rational quantity under a radical form.’;

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule;

‘in the body free radicals are high-energy particles that ricochet wildly and damage cells’;

a person who has radical ideas or opinions

a character conveying the lexical meaning of a logogram

a sign placed in front of an expression to denote that a root is to be extracted

(linguistics) the form of a word after all affixes are removed;

‘thematic vowels are part of the stem’;

(used of opinions and actions) far beyond the norm;

‘extremist political views’; ‘radical opinions on education’; ‘an ultra conservative’;

markedly new or introducing radical change;

‘a revolutionary discovery’; ‘radical political views’;

arising from or going to the root;

‘a radical flaw in the plan’;

of or relating to or constituting a linguistic root;