UN - Geographic Information Systems
A measure of the smallest detail that can be distinguished on a map or in a digital database. Resolution determines the accuracy at which the location and shape of a map feature can be accurately represented at the given map scale. In raster GIS and image data, resolution is sometimes used to refer to the cell or pixel size.
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009