Definitions
1.nounA property which is not essential; a nonessential; anything happening accidentally.
2.nounThose 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.
3.nounA sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature, but before a particular note.
4.nounPart of a text that has a mainly structural purpose, such as spelling, punctuation or capitalization.
5.adjectiveNot essential; incidental, secondary.
6.adjectiveNonessential to something's inherent nature (especially in Aristotelian thought).
7.adjectiveAdjusted by one or two semitones, in temporary departure from the key signature.
8.adjectiveOccurring sometimes, by chance; occasional.
9.adjectiveHappening by chance, or unexpectedly; taking place not according to the usual course of things; by accident, unintentional.
10.adjectiveBeing a double point with two distinct tangent planes in 4-dimensional projective space.