1. The story that is told in a novel or play or movie etc.
2. A secret scheme to do something (especially something underhand or illegal); SYN. secret plan.
3. A small area of planted ground; SYN. plot of ground, patch.
4. A chart or map showing the movements or progress of an object.
The storyline in a novel, play, film, or other work of fiction. A plot is traditionally a scheme of connected events.
Novelists in particular have at times tried to subvert or ignore the reader's expectation of a causally linked story with a clear beginning, middle, and end, with no loose ends. James Joyce and Virginia Woolf wrote novels that explore the minutiae of a character's experience, rather than telling a tale. However, the tradition that the novel must tell a story, whatever else it may do, survives for the most part intact.
English novelist E M Forster defined it thus: The king died and then the queen died. The king died and then the queen died of grief at the king's death. The first is the beginning of a series of events; the second is the beginning of a plot.

To plan secretly, usually something illegal

To create a graphic or a diagram by connecting points representing variables (values) that are defined by their positions in relation to a horizontal (x) axis and a vertical (y) axis (and sometimes a depth, or z, axis).