Presupposes an upcoming meeting with the person we greet.
Dream dictionary: Greet dream meanings
…Greeting someone in a dream means receiving benefits from him. If one greets an opponent in a dream, then it represents evil or war between them. If one sees an unknown old man greeting him in a dream, it means safety from the divine chastisement for one’s sins. If the old man is known to him, then it means prosperity. If one is a farmer, it means that he will buy seedlings of fruit trees for his farm. If the greetings are given by an unknown young person in the dream, it means that one will escape from the blow of his enemy. If one is seeking marriage, then the greetings mean a positive reply. Otherwise, if one greets someone he does not know in a dream, and if the other person does not reply, it means that his request for marriage will be denied. If two merchants greet…