Not essential; incidental, secondary. from 14th c.
Nonessential to something's inherent nature (especially in Aristotelian thought). from 14th c.
Adjusted by one or two semitones, in temporary departure from the key signature. from 16th c.
Occurring sometimes, by chance; occasional. from 16th c.
Happening by chance, or unexpectedly; taking place not according to the usual course of things; by accident, unintentional. from 16th c.
Being a double point with two distinct tangent planes in 4-dimensional projective space.
A property which is not essential; a nonessential; anything happening accidentally.
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 sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature, but before a particular note.
Of, pertaining to, or situated in, the occident, or west; western. from 16th c.
Of a gem or precious stone: of inferior value or quality. from 18th c.
A Western Christian of the Latin rite