adj.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. Of or relating to a secondary color or colors.
9. 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.
10. Botany Of, relating to, or derived from a lateral meristem, especially a cambium.
n. pl. sec·ond·ar·ies 1. One that acts in an auxiliary, subordinate, or inferior capacity.
2. One of the shorter flight feathers projecting along the inner edge of a bird's wing.
3. Electricity A coil or circuit having an induced current.
4. a. Astronomy A celestial body that revolves around another; a satellite.
b. The dimmer star of a binary star system.
5. A secondary color.
6. Football The defensive backfield.