to mark directions for delivery on (e.g. a letter or package)
to speak or write directly to (somebody)
to deliver a formal speech to (a group of people)
(+ to) to communicate (something) directly to somebody
Address your thanks to your host
(+ as) to greet (somebody) by a prescribed form
They addressed him as ‘My Lord’
(+ to) to direct the efforts or attention of (oneself) to something
He addressed himself to the problem
to deal with, or apply oneself to, or tackle (e.g. a problem)
in golf etc, to take one's stance and adjust the club before hitting (the ball)