In the finished film, one uninterrupted image with a single (static or mobile) framing.

two or more shots edited together that alternate characters, typically in a conversation situation. In continuity editing, characters in one framing usually look left, in the other framing, right. Over-the-shoulder framings are common in shot/reverse-shot editing.

lighting coming from one side of a person or a object, usually in order to create a sense of volume, to bring out surface tensions, or to fill in areas left shadowed by light from another source.

in semiology, the basic unit of signification composed of signifier (which carries the meaning) and signified (which is the concept or thing signified). In written language, for example, the word "tree" is the signifier, the idea of the tree the signified; the whole sign is comprised of both elements. In cinema, the signified, the idea of tree, remains the same, but the signifier, the image (or even the sound) of the tree is much more complex. See semiology.