add by mixing or blending on or attaching; "work in the butter and the dough will get the right consistency"; "In his speech, the presidential candidate worked in a lot of learned words"
belonging to this earth or world; not ideal or heavenly; "not a fairy palace; yet a mundane wonder of unimagined kind"; "so terrene a being as himself"
concerned with the world or worldly matters; "mundane affairs"; "he developed an immense terrestrial practicality"
endorsed authoritatively as having met certain requirements; "a certified public accountant"
holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill; "a registered pharmacist"; "a registered hospital"
having quality or payment or delivery guaranteed; "certified milk"; "certified check"; "certified mail"