a plot of ground: a distinct, marked-off piece of land, and by extension the share of land assigned to someone
This is the ordinary word for a specific piece of ground. Not open countryside, but a bounded parcel that belongs to somebody, has edges, and can be bought, sold, farmed, fought over, or ruined. It is the word for the field Jacob bought at Shechem, the barley plot Naboth owned that cost him his life, and the strip of lentils David's warrior defended single-handed.
Because a piece of land is also something handed out and owned, the word stretches naturally from the physical plot to the idea of an allotted share, the portion that falls to a person. The two shades are close: even when it means a share, the thing shared is almost always land.
All of these senses come from a root meaning to divide or apportion. A field is, at bottom, a divided-off piece of the ground, which is why the same word can name both the parcel itself and one's assigned part of it.