Comment : You DON'T normally say that when you enter someone's space. You say it if someone has entered your space. When you enter someone's space, you begin simply by stating your business and you just walk away when you're finished.
Greeting is an act of communication in which human beings intentionally make their presence known to each other, to show attention to, and to suggest a type of relationship (usually cordial) or social status (formal or informal) between individuals or groups of people coming in contact with each other. Greetings sometimes are used just prior to a conversation or to greet in passing, such as on a sidewalk or trail. While greeting customs are highly culture and situation-specific and may change within a culture depending on social status and relationship, they exist in all known human cultures. Greetings can be expressed both audibly and physically, and often involve a combination of the two. This topic excludes military and ceremonial salutes but includes rituals other than gestures. A greeting, or salutation, can also be expressed in written communications, such as letters and emails.
Noun 1. (usually plural) an acknowledgment or expression of good will (especially on meeting) (synonym) salutation (hypernym) acknowledgment, acknowledgement (hyponym) well-wishing (derivation) greet (classification) plural, plural form