noun

1. "Hello!" or an equivalent greeting.

Synonyms: greeting

verb

1. To greet with "hello".

interjection

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

   “Hello, everyone.”

2. A greeting used when answering the telephone.

   “Hello? How may I help you?”

3. 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?”