Meaning of SECONDARY in English
1》 coming after, less important than, or resulting from something primary.
2》 relating to education for children from the age of eleven to sixteen or eighteen.
3》 of or denoting the output side of a transformer or other inductive device.
4》 Chemistry (of an organic compound) having its functional group on a carbon atom bonded to two other carbon atoms.
↘derived from ammonia by replacement of two hydrogen atoms by organic groups.
5》 ( Secondary ) Geology former term for Mesozoic .
6》 (of a cell or battery) having a reversible chemical reaction and therefore able to store energy.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004