Top Definition
A major update to the mobile operating system Windows Phone 8 released in the first half of 2014. The update brings Windows Phone closer to the standards set by Android and iOS with features such as Cortana (a personal assistant), Swype keyboard and notifications/actions centre raising the standard of the Windows Phone experience
Guy: You respond to my texts quicker now, why's that?"
Girl: Upgraded to Windows Phone 8.1. The Notifications Centre and Swype keyboard allow me to respond quicker :)
by Lumiosity July 18, 2014

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