Join applies to the physical contact or union of at least two separate things and to the coming together of persons, as into a group:
The children joined hands.
The two groups joined.
Definition of join verb from the oxford advanced learner's dictionary.
[transitive, intransitive] to fix or connect two or more things together.
Join a to/onto b join one section of pipe to the next.
The meaning of joining is the act or an instance of joining one thing to another :
To join is to bring in contact, connect, or bring together.
How is join different from connect and unite?
Find out on thesaurus. com.
First recorded in 1250–1300;
Middle english joinen, from.
Present participle of join 2.
To connect or fasten things together:
If roads or rivers join.
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A join is a place where two things are fastened or fixed together.
Collins cobuild advanced learner's dictionary.
Join, connect, unite all imply bringing two or more things together more or less closely.
Joining refers to the act or process of combining, uniting, or bringing two or more things or entities together to form a single or cohesive unit.
It can also imply becoming a member or participant.
Definitions of joining noun the act of bringing two things into contact (especially for communication) the joining of hands around the table synonyms:
Connection, connexion see.