Nickname/ˈnɪkneɪm/ Definition 1 of 2Pro Tip 1/3Informal Use Nicknames are commonly used among friends or family, showcasing informality and affection. Everyone calls her 'Sunshine' because of her bright smile. Pro Tip 2/3Endearment A nickname often expresses fondness or a special bond and can be a sign of closeness. His grandma calls him 'Sweet Pea' out of endearment. Pro Tip 3/3Personality Trait People may be given nicknames based on distinctive traits, behaviors, or incidents. She's called 'Whiz' because she's a tech genius.