Media terminology, shots

The 180 degree rule
Two characters in the same scene should always be on the same left right relationship in order to maintain consistency throughout and avoid any confusion. If two characters are facing each other there is an imaginary line the camera cannot cross if it does this is called a reverse angle.

Shot reverse
Where one character is shown looking at another character then we see that character looking back, we assume they are looking at each other.

Match on action
A film editing technique where one person is shown in the same pace as he was in the last scene to create continuity and the illusion the character is moving through two scenes the same not two pieces of film cut together.