WordNet (r) 3.0 (2006):

upload
    v 1: transfer a file or program to a central computer from a
         smaller computer or a computer at a remote location [ant:
         download]

The Jargon File (version 4.4.7, 29 Dec 2003):

upload
 /uhp'lohd/, v.

    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.


The Free On-line Dictionary of Computing (30 December 2018):

upload

   /uhp'lohd/ To transfer programs or data over a digital
   communications link from a smaller or peripheral "client"
   system to a larger or central "host" one.

   Opposite: download.

   [Jargon File]

   (1994-10-27)