a flexible line of connected metal rings or links, used for connecting, fastening, holding etc

succession, series

an edge, point of contact, shared between two things; an apparatus used to join two different computer parts

link, connection

(an instance of) joining or being joined

connection

a shaped hole cut in a piece of wood to receive the end of another piece (the tenon)

link, connection

a line of people waiting for their turn (e.g. to enter a cinema, get on a bus); a line of vehicles waiting to proceed

sequence

a connected series of events, ideas etc

series, order

the coming of one thing after another in time or order

continuation

a number of railway coaches etc joined together; to give (a person, animal) teaching and practice in a skill or profession

series

(an instance of) joining or uniting and being joined; a nation formed by joining a group of countries or states

merger, joining