Definitions from Wiktionary ( )

▸ adjective:  Pertaining to accident and not essence; thus, inessential; incidental; secondary.
▸ adjective:  (philosophy) Nonessential to something's inherent nature (especially in Aristotelian thought).
▸ adjective:  (music) Adjusted by one or two semitones, in temporary departure from the key signature.
▸ adjective:  Occurring sometimes, by chance; occasional.
▸ adjective:  Happening by chance, or unexpectedly; taking place not according to the usual course of things; by accident, unintentional.
▸ adjective:  (geometry) Being a double point with two distinct tangent planes in 4-dimensional projective space.
▸ noun:  A property which is not essential; a nonessential; anything happening accidentally.
▸ noun:  (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.
▸ 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.
▸ noun:  Part of a text that has a mainly structural purpose, such as spelling, punctuation, or capitalization.

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