secondary

Forms

1.Next in order to the first or primary; of second place in origin, rank, etc.
2.Originating from a deputy or delegated person or body.
3.Derived from a parent compound by replacement of two atoms of hydrogen by organic radicals.
4.Produced by alteration or deposition subsequent to the formation of the original rock mass.

1.Any flight feather attached to the ulna (forearm) of a bird.
2.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.
3.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.
4.An act of issuing more stock by an already publicly traded corporation.

Uncommon· #3494

From Middle English secundarie

From Latin secundārius (“of the second class or quality”)