1.
a. Of the second rank; not primary. b. Inferior. c. Minor; lesser.
2. Derived from what is primary or original: a secondary source; a secondary infection.
3. Of, relating to, or being the shorter flight feathers projecting along the inner edge of a bird's wing.
4. Electricity. Having an induced current that is generated by an inductively coupled primary. Used of a circuit or coil.
5. Chemistry. Characterized or formed by replacement of two atoms or radicals within a molecule. Used of a compound.
6. Geology. Produced from another mineral by decay or alteration.
7. Of or relating to a secondary school: secondary education.
8. Being a degree of health care intermediate between that offered in a physician's office and that available at a research hospital, as the care typically offered at a clinic or community hospital.
9. Botany. Of, relating to, or being growth or tissue caused by activity of the cambium and resulting in wider branches and stems: secondary xylem.