A word or phrase that you use to show you love someone. (Cambridge Dictionary)
A word or an act (such as a caress) expressing affection. (Merriam – Webster)
An endearment is a loving or affectionate word or phrase that you say to someone you love. (Collins Dictionary)
A word or phrase expressing love or affection. (Oxford Dictionaries)
Love or affection. (Oxford Dictionaries)
French Terms or endearment.
70 Terms of Endearment from Around the World (for Those You Love)
English Terms of Endearmen
This is a common way to address a romantic partner (male or female). It would be weird if you said it to someone you’re not in a relationship with.
Sometimes this is shortened to “babe”. However, “babe” is also a slang term for an attractive woman.
A very affectionate term for a loved one or romantic partner. “Sweetie” is also common.