n 1: a close personal relationship that forms between people (as between husband and wife or parent and child) 2: (dentistry) a technique for repairing a tooth; resinous material is applied to the surface of the tooth where it adheres to the tooth's enamel 3: fastening firmly together [syn: bonding, soldering]
nounDate: 1969 1. the formation of a close relationship (as between a mother and child or between a person and an animal) especially through frequent or constant association 2. the attaching of a material (as porcelain) to a tooth surface especially for cosmetic purposes
Any of the interactions that account for the association of atoms into molecules, ions, crystals, metals, and other stable species. When atoms' nuclei and electrons interact, they tend to distribute themselves so that the total energy is lowest; if the energy of a group arrangement is lower than the sum of the components' energies, they bond. The physics and mathematics of bonding were developed as part of quantum mechanics. The number of bonds an atom can form, its valence, equals the number of electrons it contributes or receives. Covalent bonds form molecules: Atoms bond to specific other atoms by sharing an electron pair between them. If the sharing is even, the molecule is not polar; if it is uneven, the molecule is an electric dipole. Ionic bonds are the extreme of uneven sharing: Cations give up electrons, anions take them up, and all the ions are held together in a crystal by electrostatic forces. In crystalline metals, a diffuse electron sharing bonds the atoms (metallic bonding). Other types include hydrogen bonding; bonds in aromatic compounds; coordinate covalent bonds; multicenter bonds, exemplified by boranes (boron hydrides), in which more than two atoms share electron pairs; and the bonds in coordination complexes (see transition element), still poorly understood. See also van der Waals forces.
(*) In electrical engineering, the process of connecting together metal parts so that they make low resistance electrical contact for direct current and lower frequency alternating currents. See also earthing.
Bond Bond (b[o^]nd), v. t. [imp. & p. p. Bonded; p. pr. & vb. n. Bonding.] 1. To place under the conditions of a bond; to mortgage; to secure the payment of the duties on (goods or merchandise) by giving a bond. 2. (Arch.) To dispose in building, as the materials of a wall, so as to secure solidity.