A loan translation of Latin locus communis (Greek koinos topos, 'common place'), meaning a general argument or rhetorical theme applicable to many situations. In the 16th century, a commonplace was a general heading or notable passage recorded in a notebook ('commonplace book'). By the 17th century the word had extended to mean any observation so familiar it had lost its force, giving rise to the modern adjective sense of 'ordinary, unremarkable'.