Accidental

Adjective

  • (philosophy) Nonessential to something's inherent nature (especially in Aristotelian thought). [from 14th c.]
  • Happening by chance, or unexpectedly; taking place not according to the usual course of things; by accident, unintentional. [from 16th c.]
  • Not essential; incidental, secondary. [from 14th c.]
  • Occurring sometimes, by chance; occasional. [from 16th c.]
  • (music) Adjusted by one or two semitones, in temporary departure from the key signature. [from 16th c.]
  • (geometry) Being a double point with two distinct tangent planes in 4-dimensional projective space.

Noun

  • (music) A sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature, but before a particular note.
  • (painting, plural only) Those fortuitous effects produced by luminous rays falling on certain objects so that some parts stand forth in abnormal brightness and other parts are cast into a deep shadow.
  • A property which is not essential; a nonessential; anything happening accidentally.

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