The term 'secondary' can be defined as something that is of LESSER importance or rank than the primary thing. This can be seen in the crossword solutions given, such as 'LESS' (4 letters), which means not as much; 'MINOR' (5 letters), which means not as important; 'AUXILIARY' (9 letters), which means providing assistance; 'INSIGNIFICANT' (13 letters), which means not important; 'CONTINGENT' (10 letters), which means dependent on something else; 'EXTRA' (5 letters), which means additional; 'LESSER' (6 letters), which means smaller; and 'DERIVATIVE' (10 letters), which means coming from something else. All of these words describe something that is not as important or significant as the primary thing.