1.Definition: completely ordinary and unremarkable
"Air travel has now become commonplace", "Commonplace everyday activities"
2.Definition: not challenging; dull and lacking excitement
Related Adjective(s):humdrum, prosaic, unglamorous, unglamourous
3.Definition: repeated too often; overfamiliar through overuse
"His remarks were trite and commonplace"
Related Adjective(s):banal, hackneyed, shopworn, stock, threadbare, timeworn, tired, trite