Noah Webster
Errant
ER'RANT, adjective [Latin errans, from erro, to err.]
1. Wandering; roving; rambling; applied particularly to knights, who, in the middle ages, wandered about to seek adventures and display their heroism and generosity, called knights errant
2. Deviating from a certain course.
3. Itinerant.
Errant, for arrant, a false orthography. [See Arrant.]