You can call `hello' to attract someone's attention. Very softly, she called out: `Hallo? Who's there?'
formulae You say `Hello' to someone at the beginning of a telephone conversation, either when you answer the phone or before you give your name or say why you are phoning. A moment later, Cohen picked up the phone. `Hello?'
formulae You say `Hello' to someone when you meet them. Hello, Trish Do you want to pop your head in and say hallo to my girlfriend? Hello is also a noun. The salesperson greeted me with a warm hello
There are various ways to greet people when entering a chatting room, and an obvious one would seem to be "hello" But this is fraught with danger if you are in a Christian room and your typing is not exactly first rate, for there's always a chance of missing that O at the end and saying "Hell everyone", or "Hell Freddy" or just plain "Hell!" Pandemonium then breaks out as everyone thinks the Enemy has just brought forward one of his servents to tear the room apart and there're a variety of reactions that you can sit back and watch with amusement before you log out and try this new-found trick somewhere else
A greeting (salutation) said when meeting someone or acknowledging someone's arrival or presence
In the old world they hollered AHOY, from their boats, they yelled HAIL, from their castle tops, they said GOOD DAY to wish you well, and used the word GREETINGS (bon jour), when they wrote letters No one ever said HELLO Along came the telephone and now everyone says HELLO