Connection (noun)

1. A relationship in which a thing or person is linked or associated with something else.
2. A link or relationship between things or people.
3. A person who can provide access to others or help introduce people.
4. A means of communication or transport between places.

Origin:

Late middle english: from latin connexio(n-) 'a joining', from conectere 'connect', from con- 'together' + -ectere, from ligare 'to bind'.

Examples:

1. The connection between love and happiness has been proven in many studies.
2. He has good connections in the business world.
3. She is an excellent hostess who knows how to make the right connections.
4. The city has a good connection to the airport by train.
5. She was searching for a connection between the two events.