n (anatomy) A muscular organ that pumps blood through the body, traditionally thought to be the seat of emotion.
n (uncountable) One's feelings and emotions, especially considered as part of one's character.
n The seat of the affections or sensibilities, collectively or separately, as love, hate, joy, grief, courage, etc.; rarely, the seat of the understanding or will; usually in a good sense; personality.
n Emotional strength that allows one to continue in difficult situations; courage; spirit; a will to compete.
n Vigorous and efficient activity; power of fertile production; condition of the soil, whether good or bad.
n (archaic) A term of affectionate or kindly and familiar address.
n (obsolete, except in the phrase "by heart") Memory.
n (figurative) A wight or being.
n A conventional shape or symbol used to represent the heart, love, or emotion: ♥.
n (card games) A playing card of the suit hearts featuring one or more heart-shaped symbols.
n (cartomancy) The twenty-fourth Lenormand card.
n (figurative) The centre, essence, or core.
v (transitive, humorous, informal) To be fond of. Often bracketed or abbreviated with a heart symbol.
v (transitive, obsolete) To give heart to; to hearten; to encourage.
v (transitive, masonry) To fill an interior with rubble, as a wall or a breakwater.
v (intransitive, agriculture, botany) To form a dense cluster of leaves, a heart, especially of lettuce or cabbage.
n A surname.