hello

A greeting (salutation) said when meeting someone or acknowledging someone’s arrival or presence.

Hello, everyone.

A greeting used when answering the telephone.

Hello? How may I help you?

Hello. This is Marsha. ― Yes, Marsha.

A call for response if it is not clear if anyone is present or listening, or if a telephone conversation may have been disconnected.

Hello? Is anyone there?

I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the top of my lungs. […] The Colonel woke up, and, after asking what in brimstone was the matter, opened his mouth and roared “Hi!” and “Hello!” like the bull of Bashan.

Used sarcastically to imply that the person addressed has done something the speaker considers to be foolish, or missed something that should have been obvious.

You just tried to start your car with your cell phone. Hello?

Uh, hello? We're using a CANNON to get to the moon? Isn't that, like, dangerous?

An expression of puzzlement or discovery.

Hello! What’s going on here?

"Hello!" or an equivalent greeting.

They gave each other a quick hello when they met, and went back on their merry ways.

In many new buildings, though, neighbors are venturing beyond tight-lipped hellos at the mailbox.

To greet with "hello".

She is there guarding and looking after the candy and the children generally, and she helloes and renders an exclamation that Maidie is crossing the street.

He helloes to my daughter:[…]