Sweetie (noun)

1. A term of endearment for someone one loves or cares for.
2. A term of affection for someone one finds attractive.
3. A term of address for someone one is fond of.
4. A term of address for someone one is close to.
5. A term of address for someone one is intimate with.

Origin:

From sweet + -ie.

Examples:

1. He called her sweetie when he saw her.
2. She called him sweetie when they talked on the phone.
3. The couple called each other sweetie all the time.
4. My sweetie is coming to visit me next week.
5. He always calls his girlfriend sweetie.