The term 'in installments' can be described by the crossword solutions of SERIAL (6 letters), EPISODIC (8 letters), ontime (6 letters), and serially (8 letters). SERIAL means occurring in a series or sequence, EPISODIC refers to something that is divided into separate parts or episodes, ontime means happening at the expected or appointed time, and serially means arranged in a series. Together, these words describe the concept of paying for something in multiple parts over a period of time.