Proximation is a term that refers to the state of being near or close to something. Some common synonyms for proximation include approximation, closeness, nearness, adjacency, and propinquity. These words all describe a state of being in close proximity to something else. Approximation, for example, refers to an estimate or a rough calculation that is close to the true value. Closeness and nearness both imply physical proximity to something or someone, while adjacency describes things that are adjacent or contiguous to one another. Propinquity is a more formal term that refers to the state of being close in time, place, or relationship.