GPS Overview - The Sky's The Limit. GPS, or Global Positioning System, is a satellite-based navigation system developed by the U.S. Department of Defense to provide a consistent, accurate method of simplifying navigation. It was originally designed for the military, however, it provides both commercial and recreational users 24 hour, worldwide navigation coverage with a possible accuracy to 15 meters (49 feet).
proÂ·lifÂ·erÂ·ate. v. proÂ·lifÂ·erÂ·atÂ·ed, proÂ·lifÂ·erÂ·atÂ·ing, proÂ·lifÂ·erÂ·ates. v. intr. 1. To grow or multiply by rapidly producing new tissue, parts, cells, or offspring. 2. To increase or spread at a rapid rate: fears that nuclear weapons might proliferate. v. tr. To cause to grow or increase rapidly.
Medical Definition of human ecology. 1: a branch of sociology concerned especially with the study of the spatial and temporal interrelationships between human beings and their economic, social, and political organization.