Etymology
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errant (adj.)

mid-14c., "traveling, roving," from Anglo-French erraunt, from two Old French words that were confused even before they reached English: 1. Old French errant, present participle of errer "to travel or wander," from Late Latin iterare, from Latin iter "journey, way," from root of ire "to go" (from PIE root *ei- "to go"); 2. Old French errant, past participle of errer (see err). The senses fused in English 14c., but much of the sense of the latter since has gone with arrant.

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Definitions of errant

errant (adj.)
straying from the right course or from accepted standards;
errant youngsters
errant (adj.)
uncontrolled motion that is irregular or unpredictable;
an errant breeze
From wordnet.princeton.edu