What are the meanings of words hi or hello in English?

"Hi" and "Hello" are both informal greetings in English. They are used to acknowledge someone's presence and to begin a conversation.

Here are some nuances:

* "Hi" is more casual and shorter than "hello." It is often used among friends and family members.

* "Hello" is slightly more formal than "hi" and can be used in a wider range of situations, including with strangers or people you don't know very well.

Both "hi" and "hello" express a friendly and welcoming tone. They are versatile greetings and can be used in a variety of contexts.