hit
As used in reference to the World Wide Web, 'hit' means a single request from a web browser for a single item from a web server.
Thus in order for a web browser to display a page that contains 3 graphics, 4 'hits' would occur at the server: 1 for the HTML page, and one for each of the 3 graphics. 'hits' are often used as a very rough measure of load on a server, e.g. 'Our server has been getting 300,000 hits per month.' Because each 'hit' can represent anything from a request for a tiny document (or even a request for a missing document) all the way to a request that requires some significant extra processing (such as a complex search request), the actual load on a machine from 1 hit is almost impossible to define.