the verb 'be' when used to join a subject to its compliment, as in 'The baby is a boy', 'It is Thursday today'

intersection, juncture

a large number of people together but without order or organization

large assembly

the mark ( - ) used to join two words together, as in Anglo-French, between syllables, as in co-op, or to divide a word at the end of a written or printed line, as in hy-phen

intersection, juncture

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

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

merger, joining