The term 'THE PURPOSE SERVE' can be broken down into two crossword solutions: 'THE PURPOSE' and 'SERVE'. 'THE PURPOSE' is a 5 letter word, 'AVAIL'. The word 'AVAIL' means to make something available or to take advantage of an opportunity. 'SERVE' is a 4 letter word meaning to work for someone else in order to fulfill a need or provide a service. Together, the phrase 'THE PURPOSE SERVE' can be interpreted as making oneself available to fulfill a need or provide a service.