1. (noun) a usually secretive or illicit sexual relationship

• affair
• affaire
• amour
• intimacy
• involvement

2. (noun) a channel for communication between groups

• contact
• inter-group communication
• link

1. (noun) a usually secretive or illicit sexual relationship

• sexual relationship

2. (noun) a channel for communication between groups

• channel
• communication channel
• line

1. (noun) a channel for communication between groups

• contact
• get hold of
• get through
• reach