inadvertence

noun

Etymology: From Middle French inadvertance.

1. The state or quality of being inadvertent; inadvertency; heedlessness; carelessness; negligence.

   “Many mistakes proceed from inadvertence.”

2. An effect or result of inattention; an oversight or mistake from negligence.

   “The size is an inadvertence like the tailor's stitches, to allow a style to emerge.”