noun

• (uncountable) The conscious production or arrangement of sounds, colours, forms, movements, or other elements in a manner that affects the senses and emotions, usually specifically the production of the beautiful in a graphic or plastic medium.
• (uncountable) The creative and emotional expression of mental imagery, such as visual, auditory, social, etc.
• (countable) Skillful creative activity, usually with an aesthetic focus.
• (uncountable) The study and the product of these processes.
• (uncountable) Aesthetic value.
• (uncountable) Artwork.
• (countable) A field or category of art, such as painting, sculpture, music, ballet, or literature.
• (countable) A nonscientific branch of learning; one of the liberal arts.
• (countable) Skill that is attained by study, practice, or observation.
• (uncountable, dated) Contrivance, scheming, manipulation.
• A diminutive of the male given name Arthur, from the Celtic languages.
• Abbreviation of assisted reproductive technology. [(medicine) Any technological means of inducing pregnancy, for example by artificial insemination.]
• Abbreviation of Androgen Replacement Therapy.
• Abbreviation of Active Release Technique.
• Abbreviation of Adaptive resonance theory.
• Abbreviation of Algebraic Reconstruction Technique.
• Abbreviation of Alternative Risk Transfer.
• Abbreviation of acoustic resonance technology.
• Abbreviation of anti-retroviral therapy.