The term 'It's Indispensable' can be summed up by the crossword solution of 'NECESSITY' which has 9 letters. NECESSITY is defined as something that is essential, unavoidable, or absolutely required. It is an important concept in many fields such as philosophy, economics, and law. In philosophy, it is used to describe the fundamental requirements of human life. In economics, it is used to describe the basic goods and services that are needed for a society to function. In law, it is used to describe the basic rights and obligations that must be respected by all parties. In short, NECESSITY is an indispensable part of life.