Organic uplift (aka organic multiplier) indicates the number of organic installs coming from paid user acquisition campaigns. Mobile advertising and user acquisition campaigns can boost both the visibility of an app and app store rankings. As a result of this, the number of organic users increases and this gives app developers and mobile advertisers the organic uplift percentage. Organic uplift can be calculated by analyzing the organic users during and after a paid advertising campaign.  

Because it is about the increasing virality, it can be similar to K-factor.