Definitions from Wiktionary ( )

▸ noun:  A series of interconnected rings or links usually made of metal.
▸ noun:  A series of interconnected things.
▸ noun:  A series of stores or businesses with the same brand name.
▸ noun:  (organic chemistry, physical chemistry) A number of atoms in a series, which combine to form a molecule.
▸ noun:  (surveying) A series of interconnected links of known length, used as a measuring device.
▸ noun:  (surveying) A long measuring tape.
▸ noun:  A unit of length, exactly equal to 22 yards, 4 rods or 100 links, and approximately equal to 20.12 metres; the length of a Gunter's surveying chain; the length of a cricket pitch.
▸ noun:  (mathematics, set theory, order theory) A totally ordered set, especially a totally ordered subset of a poset.
▸ noun:  (algebraic topology, originally) A formal sum of cells in a CW complex of a certain dimension k (in which case the formal sums are called k'''-chains); a formal sum of simplices or cubes of a certain dimension in a simplical complex or cubical complex (respectively).
▸ noun:  (algebraic topology, homological algebra, more generally) An element of a group (or module) in a chain complex.
▸ noun:  (British) A sequence of linked house purchases, each of which is dependent on the preceding and succeeding purchase (said to be "broken" if a buyer or seller pulls out).
▸ noun:  That which confines, fetters, or secures; a bond.
▸ noun:  (nautical, in the plural) Iron links bolted to the side of a vessel to bold the dead-eyes connected with the shrouds; also, the channels.
▸ noun:  A livery collar, a chain of office.
▸ noun:  (weaving) The warp threads of a web.
▸ verb:  (transitive) To fasten something with a chain.
▸ verb:  (figurative) To connect as if with a chain, due to dependence, addiction, or other feelings
▸ verb:  (intransitive) To link multiple items together.
▸ verb:  (transitive) To secure someone with fetters.
▸ verb:  (transitive) To obstruct the mouth of a river etc with a chain.
▸ verb:  (figurative) To obligate.
▸ verb:  (computing) To relate data items with a chain of pointers.
▸ verb:  (computing) To be chained to another data item.
▸ verb:  (transitive) To measure a distance using a 66-foot long chain, as in land surveying.
▸ verb:  (transitive, computing, rare, associated with Acorn Computers) To load and automatically run (a program).
▸ noun:  A surname.

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