Secondary may refer to:

Science and nature

* Secondary emission, of particles ** Secondary electrons, electrons generated as ionization products * The secondary winding, or the electrical or electronic circuit connected to the secondary winding in a transformer * Secondary (chemistry), a term used in organic chemistry to classify various types of compounds * Secondary color, color made from mixing primary colors * Secondary mirror, second mirror element/focusing surface in a reflecting telescope * Secondary craters, often called "secondaries" * Secondary consumer, in ecology * An obsolete name for the Mesozoic in geosciences * Secondary feathers, flight feathers attached to the ulna on the wings of birds

Society and culture

* Secondary (football), a position in American football and Canadian football * Secondary dominant in music * Secondary education, education which typically takes place after six years of primary education ** Secondary school, the type of school at the secondary level of education * Secondary market, an aftermarket where financial assets are traded

Science and nature

Society and culture

See also