Definition of gateways:
(n) :
A place regarded as giving access to somewhere.
(n) :
Any point that represents the beginning of a transition from one place or phase to another.
(n) :
A passage that can be closed by use of a gate.
(n) :
A point at which freight moving from one territory to another is interchanged between transportation lines.
(n) :
(computing, networking, telecommunications) 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.
(n) :
(attributive) Any thing or area of interest that tends to lead to deeper involvement.