(law) A party who appeals the decision of a lower court.

Straying from the proper course or standard, or outside established limits. / Roving around; wandering. / Prone to making errors; misbehaving.

A knight-errant.

(uncountable) The result of having been worn away or eroded, as by a glacier on rock or the sea on a cliff face.

(baseball) Initialism of earned run average, a baseball statistic. / (electronics) Initialism of electrically reconfigurable array. / (military) Initialism of explosive reactive armor.

(US) Initialism of Equal Rights Amendment. / (EU, railways) Initialism of European Railway Agency (called today the European Union Agency for Railways)

The science of the design of equipment, especially so as to reduce operator fatigue, discomfort and injury. / (economics, rare) Political economy.

(literary or archaic) A mission or quest. / A mundane mission of no great consequence, concerning household or business affairs (dropping items by, doing paperwork, going to a friend's house, etc.)

(transitive) To send someone on an errand. / (intransitive) To go on an errand.

(poetic) Ireland. / A town in Ontario. / A town in Wisconsin. / A town in New York. / A city, the county seat of Houston County, Tennessee. / An unincorporated community in Texas.