What is the meaning of Errant?

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

Roving around; wandering.

Prone to erring 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