gateway

Short definition from Wiktionary

Noun

1. 1
   A passage that can be closed by use of a gate.
2. 2
   A place regarded as giving access to somewhere.
3. 3
   Any point that represents the beginning of a transition from one place or phase to another.
4. 4
   Any point that represents the beginning of a transition from one place or phase to another: Any thing or area of interest that tends to lead to deeper involvement.
5. 5
   A point at which freight moving from one territory to another is interchanged between transportation lines.
6. 6
   In wireless internet, an access point with additional software capabilities such as providing NAT and DHCP, which may also provide VPN support, roaming, firewalls, various levels of security, etc.

Verb

1. 1
   To make available using a gateway, or access point.