The term 'broadening' can be defined by the crossword solutions of 'EXTENSION', 'ENLARGEMENT', 'extending', and 'EGO'. EXTENSION and extending refer to the act of making something longer or wider, while ENLARGEMENT is the act of making something larger. EGO refers to a person's sense of self-importance or self-esteem. Broadening, then, is the act of expanding or increasing something, whether it be an object, concept, or one's own sense of self.