Heart/hɑːrt/ Definition 1 of 5Pro Tip 1/3Medical Context Used in discussions about health, usually serious or life-threatening conditions. After the surgery, his heart is functioning better. Pro Tip 2/3Expressions of Love 'Heart' symbolizes love and affection, commonly used in Valentine's Day imagery. I drew a heart on the card for my Valentine. Pro Tip 3/3Metaphorical Use Refers metaphorically to the essence or core of emotions in creative writing or speech. Her words touched the hearts of everyone in the room.