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.
Morrow County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 34,827. Its county seat is Mount Gilead.