Area - A description of the dimension or content of a polygon.

Coordinate System - A fixed reference framework superimposed onto the surface of an area to designate the position of a point within it by using x and y coordinates. The State Plane Coordinate System and the system of latitude and longitude used on the Earth's surface are common examples.

Data - A collection of facts, concepts or instructions in a formalized manner suitable for communication or processing by human or automatic means. Generally used in the GIS field as a reference to all spatial information.

Feature - A spatial element which represent a real-world entity by having specific characteristics. Often used synonymously with the term object. A generalized description of a point, line or polygon.

Field -A location in a data record in which a unit of information is stored. For example, in a database of addresses, one field would be 'city'.

Geocoding -The process by which the geographic coordinates of a location are determined by its address, postal code, or other explicitly non-geographic descriptor.

GIS - A geographic information system (GIS) is a framework for gathering, managing, and analyzing data. Rooted in the science of geography, GIS integrates many types of data. It analyzes spatial location and organizes layers of information into visualizations using maps and 3D scenes.

Legend - The description of the symbology representing features on a map.

Map - A graphic representation of geographically distributed phenomena. The information displayed may be in the form of symbols or signs.

North Arrow - The graphical representation of which direction north is on the map.

Scale -The ratio or fraction between the distance on a map, chart or photograph and the corresponding distance in the real world.

Scale Bar - A map element which shows the scale of a map graphically.

Set - A group of features and their data.

Shapefile - A set of files that contain a set of points, arcs, or polygons (or features) that hold tabular data and a spatial location. 

Spatial - An adjective. Of, relating to, or occurring in space.

Table - A means of organizing data in rows and columns in which each row represents an individual entity, record, or feature and each column represents a single field or attribute value.

Query - A way of selecting features based on a set of common characteristics. For example, the act of selecting all the buildings that have an area greater than 2000 sq. ft. out of a database.