The phrase "main gateway" refers to the primary entrance or access point to a certain place or system, often symbolizing the most important or significant entrance. Full definition
You can also admire some remarkable Roman ruins, including the vestiges of the impressive main gateway. (loveholidays.com)
The inferno blackened miles along one of the main gateways into wine country, State Highway 12 into Sonoma County. (businessinsider.com)
Google hopes that showing app - only content in search results and letting users view the info in their mobile browser without downloading the app will help its search engine remain users» main gateway to online content in the era of smartphones. (businessinsider.com)