A usual or ordinary thing; something that is not unusual or special.
Smartphones have become a commonplace in today's society.
A trite or unremarkable remark or statement.
The speech was filled with commonplaces that failed to inspire the audience.
A notebook, anthology, or book in which quotations, ideas, or observations are systematically collected and arranged under common headings; a commonplace book (now chiefly historical).
During her travels, she filled her commonplace with snippets of verse and curious facts.