the world > action or operation > behaviour > affected behaviour or affectation > [noun] > an affected manner or appearance > an affectation > habitual (3)
A peculiarity of action, manner, or habit. Cf. sense 4c. rare.
A habitual peculiarity of style or manner; an idiosyncratic habit, gesture, way of speaking, etc.
A peculiarity, especially a verbal one; a mannerism.