Aesthetics (/ɛsˈθɛtɪks/ or /iːsˈθɛtɪks/; also spelled æsthetics and esthetics) is a branch of philosophy that explores the nature of art, beauty, and taste, with the creation and appreciation of beauty.
In its more technically epistemological perspective, it is defined as the study of subjective and sensori-emotional values, sometimes called judgements of sentiment and taste. More broadly, scholars in the field define aesthetics as "critical reflection on art, culture and nature". In modern English, the term aesthetic can also refer to a set of principles underlying the works of a particular art movement or theory: one speaks, for example, of the Cubist aesthetic.
The word aesthetic is derived from the Greek αἰσθητικός (aisthetikos, meaning "esthetic, sensitive, sentient, pertaining to sense perception"), which in turn was derived from αἰσθάνομαι (aisthanomai, meaning "I perceive, feel, sense"). The term "aesthetics" was appropriated and coined with new meaning by the German philosopher Alexander Baumgarten in his dissertation Meditationes philosophicae de nonnullis ad poema pertinentibus ("Philosophical considerations of some matters pertaining the poem") in 1735, even though his later definition in the fragment Aesthetica (1750) is more often referred to as the first definition of modern aesthetics.