[ur, er]
verb (used without object)
to go astray in thought or belief; be mistaken; be incorrect.
to go astray morally; sin: To err is human.
Archaic. to deviate from the true course, aim, or purpose.

1275–1325; Middle English erren < Old French errer < Latin errāre; akin to Gothic airzjan, Old High German irrôn, German irren

errability, noun
errable, adjective

1. air, e'er, ere, err, heir ; 2. er, err, ur-, Ur.

2. transgress, lapse. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
err (ɜː)
1.  to make a mistake; be incorrect
2.  to stray from the right course or accepted standards; sin
3.  to act with bias, esp favourable bias: to err on the side of justice
[C14: erren to wander, stray, from Old French errer, from Latin errāre]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, from O.Fr. errer, from L. errare "wander, go astray, be in error" (a general Gmc. borrowing, cf. O.H.G. arunti "message," O.N. erendi, Goth. airziþa "error, deception"), from PIE base *ers- "wander around" (cf. Skt. arsati "flows," O.E. ierre "angry, straying"). Related: Erred; erring.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The film's ending errs slightly on the side of excessive sunniness, but almost
  all the rest of it is admirably understated.
In life, too often the scholar errs with mankind and forfeits his privilege.
In life too often the scholar errs with mankind and forfeits his privilege.
Academics are more likely to get grants, or tenure, if their research errs on
  the side of breadth.
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