HI definition: 1. used as an informal greeting, usually to people who you know: 2. written abbreviation for the…. Learn more.

The meaning of HI is —used especially as a greeting. How to use hi in a sentence.

HI definition: (used as an exclamation of greeting) hello! See examples of hi used in a sentence.

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A friendly, informal, casual greeting said when meeting someone. Hi, how are you? I just dropped by to say “hi”.

hi (haɪ) sentence substitute an informal word for hello [C20: originally US, from hiya]

Oct 1, 2023 · What is the meaning and origin of the word “hi”? Learn how this word has been used to greet and express interest in others.

Jul 9, 2025 · Discover the full meaning of "hi," its surprising etymology, and common uses. This entry covers definitions, examples, and phrases, offering a comprehensive look at this everyday greeting.

Dec 19, 2025 · If you’re texting friends and family that you message regularly, there’s no need to say “Hello” or “Hi” at the start of each message—simply continue your conversation without a greeting.

Hi is a common greeting, more casual than "hello." When you walk down the street in a small town, it might seem like everyone you pass says "hi."