What is the meaning of Chain?

A series of interconnected rings or links usually made of metal.

A series of interconnected things.

A series of stores or businesses with the same brand name.

A number of atoms in a series, which combine to form a molecule.

A series of interconnected links of known length, used as a measuring device.

A long measuring tape.

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.

A totally ordered set, especially a totally ordered subset of a poset.

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).

An element of a group (or module) in a chain complex.

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).

That which confines, fetters, or secures; a bond.

Iron links bolted to the side of a vessel to bold the dead-eyes connected with the shrouds; also, the channels.

A livery collar, a chain of office.

The warp threads of a web.

To fasten something with a chain.

To connect as if with a chain, due to dependence, addiction, or other feelings

To link multiple items together.

To secure someone with fetters.

To obstruct the mouth of a river etc with a chain.

To obligate.

To relate data items with a chain of pointers.

To be chained to another data item.

To measure a distance using a 66-foot long chain, as in land surveying.

To load and automatically run (a program).

Aspirate mutation of cain.

Source: wiktionary.org