1. [techspeak] To transfer programs or data over a digital communications link from a system near you (especially a smaller or peripheral client system) to one further away from you (especially a larger or central host system). A transfer in the other direction is, of course, called a download

2. [speculatively] To move the essential patterns and algorithms that make up one's mind from one's brain into a computer. Those who are convinced that such patterns and algorithms capture the complete essence of the self view this prospect with pleasant anticipation.