I have a pet method of defining words. I look them up in the dictionary. If you make up your own definition, and I have mine, and Joe Blow over there has his, pretty soon nobody has any idea what others are talking about when they speak or read.
art /’ɑːʳt/
Synonyms: noun: craft, skill, science, workmanship, knack
arts plural
1—Art consists of paintings, sculpture, and other pictures or objects which are created for people to look at and admire or think deeply about. N-UNCOUNT
...the first exhibition of such art in the West.
...contemporary and modern American art.
...Whitechapel Art Gallery.
2—Art is the activity or educational subject that consists of creating paintings, sculptures, and other pictures or objects for people to look at and admire or think deeply about. N-UNCOUNT
...a painter, content to be left alone with her all-absorbing art.
...Farnham College of Art and Design.
...art lessons.
3—The arts are activities such as music, painting, literature, cinema, and dance, which people can take part in for enjoyment, or to create works which express serious meanings or ideas of beauty. N-VAR usu ‘the’ N in pl
Catherine the Great was a patron of the arts and sciences.
...the Arts Council of Great Britain.
...the Wexner Centre for the Visual Arts.
...the art of cinema. + ‘of’
4—At a university or college, arts are subjects such as history, literature, or languages in contrast to scientific subjects. N-PLURAL oft N n
Antonym sciences
...arts and social science graduates.
...the Faculty of Arts.
5—Arts or art is used in the names of theatres or cinemas which show plays or films that are intended to make the audience think deeply about the content, and not simply to entertain them. ADJ ADJ n
...the Cambridge Arts Cinema.
6—If you describe an activity as an art, you mean that it requires skill and that people learn to do it by instinct or experience, rather than by learning facts or rules. N-COUNT
Fishing is an art.
...the unscientific arts of seduction and romance.
7—Art is an old-fashioned form of the second person singular of the present tense of the verb be.
Father, I know thou art aware of me at all times.
See also Bachelor of Arts; fine art; martial art; Master of Arts; state-of-the-art; work of art