Topic: TRANSPORT
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con‧nec‧tion S3 W2

1 the way in which two facts, ideas, events etc are related to each other, and one is affected or caused by the other [= link]COLLOCATIONS 
have a connection (with/to something) establish a connection (between two things) (=prove or discover a link) make a connection (between two things) (=realize there is a link) there is a connection (between two things) see a connection (=realize there is a connection) close/direct connection causal connection (=when one thing causes the other) tenuous/loose connection (=one that is not at all close)
relationship
[countable]
have a connection (with/to something) establish a connection (between two things) (=prove or discover a link) make a connection (between two things) (=realize there is a link) there is a connection (between two things) see a connection (=realize there is a connection) close/direct connection causal connection (=when one thing causes the other) tenuous/loose connection (=one that is not at all close)
2 when two or more things are joined together or when something is joined to a larger system or network :
a digital telephone connection via satellite
They're offering free Internet connection.
There's a £25 connection charge (=money you pay to be connected to a service such as telephones, electricity etc).
joining
[uncountable and countable]
a digital telephone connection via satellite
They're offering free Internet connection. connection to
The socket allows connection to a PC.
The socket allows connection to a PC.
There's a £25 connection charge (=money you pay to be connected to a service such as telephones, electricity etc).3 concerning or involving something
visits made to Spain in connection with her business
his work in connection with refugees
in connection with something
arrest/charge/question etc somebody in connection with a crime
Two men have been arrested in connection with the attack.
Two men have been arrested in connection with the attack.
visits made to Spain in connection with her business
his work in connection with refugees4 a wire or piece of metal joining two parts of a machine or electrical system :
an electrical connection
electrical wire
[countable]TEE
an electrical connection5 a train, bus, or plane which is arranged to leave at a time which allows passengers from an earlier train, bus, or plane to use it to continue their journey
train/flight etc
[countable]TT connection to
If this train gets delayed we'll miss our connection to Paris.
If this train gets delayed we'll miss our connection to Paris.6 a road, railway etc that joins two places and allows people to travel between them :
Cheshunt has good rail connections to London.
road/railway etc
[countable]TT
Cheshunt has good rail connections to London.7
people
connections
[plural]a) people who you know who can help you, especially because they are in positions of power :
connections in high places
We have good connections in the advertising industry.
connections in high places
We have good connections in the advertising industry.b) people who are related to you, but not very closely :
He is English, but has Irish connections.
He is English, but has Irish connections.