What is the meaning of Errant?

Straying from the proper course or standard, or outside established limits.

Roving around; wandering.

Prone to err or making errors; misbehaving.

Obsolete form of arrant (complete; downright, utter).

A knight-errant.

wandering, roving

A polychaete worm of the subclass Errantia

gerund of errar

present participle of errer

wandering, stray

errant (clarification of this definition is needed)

third-person plural present active indicative of errō

wandering; nomadic

Source: wiktionary.org