1) a cry used to attract attention; greeting (hallo)

2) a greeting given by shaking hands with a person (handshake)

3) to touch (a person) with the lips to show affection, love or as a greeting (kiss)

4) (an act of expression of) greeting or goodwill (e.g. a bow or a kiss) (salutation)

5) (used to call a greeting to a friend etc) (yoo-hoo)