performing or functioning in the best possible manner with the least waste of time and effort; having and using requisite knowledge, skill, and industry; competent; capable: a reliable, efficient assistant.
Marengo is a village in Morrow County, Ohio, United States. The population was 342 at the 2010 census. Marengo is south of Mount Gilead, the county seat.
Sponsored Topics. Marengo is a city in McHenry County, Illinois, United States. The population was 6,355 at the 2000 census. Marengo is located at 42Â°15â²3â³N 88Â°36â²18â³W / 42.25083Â°N 88.605Â°W / 42.25083; -88.605. According to the United States Census Bureau, the city has a total area of 4.0 square miles (10.3 kmÂ²), all of it land.