1. a program of rocket-powered flights undertaken by US between 1961 and 1963 with the goal of putting a man in orbit around the earth; - Example: "under the Mercury program each flight had one astronaut"
WordNet (r) 3.0 (2006):
Mercury program
n 1: a program of rocket-powered flights undertaken by US
between 1961 and 1963 with the goal of putting a man in
orbit around the earth; "under the Mercury program each
flight had one astronaut"