diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
manual turning of a fetus in the uterus (usually to aid delivery)
something a little different from others of the same type; "an experimental version of the night fighter"; "a variant of the same word"; "an emery wheel is the modern variation of a grindstone"; "the boy is a younger edition of his father"
an interpretation of a matter from a particular viewpoint; "his version of the fight was different from mine"
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"