I. book‧mark¹ /ˈbʊkmɑːk $ -mɑːrk/ 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

[TahlilGaran] Dictionary of Contemporary English ▲

II. bookmark² verb [transitive]
to save the address of a page on the Internet so that you can find it again easily

[TahlilGaran] Dictionary of Contemporary English ▲