The term PART OF USLTA is solved by the word 'LAWN'. The United States LAWN Tennis Association (USLTA) is the national governing body for tennis in the United States. It was founded in 1881 and is now known as the United States Tennis Association (USTA). The USLTA is responsible for organizing and promoting the sport of tennis in the United States, including the professional tours and tournaments. LAWN tennis is one of the most popular forms of tennis, and it is a part of the USLTA's mission to promote the sport.