secondary

1. secondary (adj) — sense 1

Definition: Next in order to the first or primary; of second place in origin, rank, etc.

2. secondary (adj) — sense 2

Definition: Originating from a deputy or delegated person or body.

Example: the work of secondary hands

3. secondary (adj) — sense 3

Definition: Derived from a parent compound by replacement of two atoms of hydrogen by organic radicals.

4. secondary (noun) — sense 4

Definition: Any flight feather attached to the ulna (forearm) of a bird.

5. secondary (noun) — sense 5

Definition: A radar return generated by the response of an aircraft's transponder to an interrogation signal broadcast by a radar installation, containing additional encoded identification and situational data not available from a simple primary return.

6. secondary (noun) — sense 6

Definition: The second stage of a multistage thermonuclear weapon, which generates a fusion explosion when imploded as an indirect result of the fission explosion of the primary, and which, in a few extremely large weapons, itself implodes a fusion tertiary.