Wandering; roving; rambling: applied particularly to knights (knights errant) of the middle ages, who are represented as wandering about to seek adventures and display their heroism and generosity.Deviating; straying from the straight, true, or right course; erring.In zoology, free; not fixed; locomotory; specifically, pertaining to the Errantia; not tubicolous: as, the errant annelids.Notorious; manifest: in this sense now spelled only arrant. See arrant, 2.n. A knight errant.Itinerant.