Secondary
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Secondary is an adjective meaning "second" or "second hand". It may refer to:
- Secondary education
- A secondary consumer in an ecological sense
- Secondary dominant, in music
- Secondary, in American football and Canadian football, the group of (usually at least four) defensive backs
- A Secondary functional group (or usually ion) attached to carbon atom connected to 2 other Carbon atoms in organic chemistry
- Secondaries, the second-largest group of remiges (wing feathers), which attach to the inner lower arm
- Secondary circuit, electrical circuit in a Transformer in which current is produced by electromagnetic induction, as opposed to a primary circuit
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