I. book ‧ mark 1 /ˈbʊkmɑːk $ -mɑːrk/ BrE AmE noun [countable]
1 . a piece of paper, leather etc that you put in a book to show you the last page you have read
2 . a way of saving the address of a page on the Internet so that you can find it again
II. bookmark 2 BrE AmE verb [transitive]
to save the address of a page on the Internet so that you can find it again easily