accidental

Definition (noun): a musical notation that makes a note sharp or flat or natural although that is not part of the key signature

Definition (adjective): happening by chance or unexpectedly or unintentionally

Example: with an inadvertent gesture she swept the vase off the table

Definition (adjective): happening by chance or unexpectedly or unintentionally

Example: accidental poisoning

Definition (adjective): happening by chance or unexpectedly or unintentionally

Example: an accidental shooting

Definition (adjective): not of prime or central importance

Example: nonessential to the integral meanings of poetry

Definition (adjective): not of prime or central importance

Example: the character’s motives remain accidental to the plot