1. 联络；联系；沟通
Liaison is co-operation and the exchange of information between different organizations or between different sections of an organization.

2. 联络人；联系人
If someone acts as liaison with a particular group, or between two or more groups, their job is to encourage co-operation and the exchange of information.

3. 私通；私情；通奸
You can refer to a sexual or romantic relationship between two people as a liaison .

1. a channel for communication between groups

e.g. he provided a liaison with the guerrillas

Synonym: linkcontactinter-group communication

2. a usually secretive or illicit sexual relationship

Synonym: affairaffaireintimacyinvolvementamour