Mars orbit rendezvous (MOR) is a concept for space travel, where a spacecraft takes off from Mars, such as a Martian ascent stage, and does a rendezvous in Mars orbit with another spacecraft.
Mars orbit rendezvous (MOR) is a space travel concept where two spacecraft meet up and/or dock in Mars orbit. For example, one vehicle takes off from Mars, such as a Martian ascent stage, and does a rendezvous in Mars orbit with another spacecraft.