Definition of "accidens"

accidens

noun
plural accidentia
1. (logic) Synonym of accident (“a property, fact, or relation that is the result of chance or is nonessential or nonsubstantive”)
  Quotations
  An Accidens (or accident) of an individual, genus, or species is any attribute which is possessed by it, and which does not follow from, or form a part of, its comprehension. […] If, on the other hand, an accidens is sometimes present and sometimes absent in an individual, […]
  1886, Prasanna K. Roy, A Text-book of Deductive Logic: For the Use of Students, page 83
  But, where there is no apparent reason why the attribute should always be found in the individuals of a class, it is called an Accidens.
  1896, James Welton, A Manual of Logic, volume 1, page 86