Definitions from Wiktionary ( )

▸ adjective:  Next in order to the first or primary; of second place in origin, rank, etc.
▸ adjective:  Originating from a deputy or delegated person or body.
▸ adjective:  (organic chemistry) Derived from a parent compound by replacement of two atoms of hydrogen by organic radicals.
▸ adjective:  (geology) Produced by alteration or deposition subsequent to the formation of the original rock mass.
▸ adjective:  (geology) Developed by pressure or other causes.
▸ adjective:  (anatomy) Pertaining to the second joint of the wing of a bird.
▸ adjective:  (medicine) Dependent or consequent upon another disease, or occurring in the second stage of a disease.
▸ adjective:  Of less than primary importance.
▸ adjective:  (education) Related to secondary education, i.e. schooling between the ages of (approximately) 11 and 18.
▸ adjective:  (manufacturing) Relating to the manufacture of goods from raw materials.
▸ adjective:  (of a color) Formed by mixing primary colors.
▸ adjective:  (taxonomy, not comparable) Representing a reversion to an ancestral state.
▸ noun:  (ornithology) Any flight feather attached to the ulna (forearm) of a bird.
▸ noun:  (aviation) 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.
▸ noun:  (military) 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.
▸ noun:  (finance) An act of issuing more stock by an already publicly traded corporation.
▸ noun:  (American football, Canadian football) The defensive backs.
▸ noun:  (electronics) An inductive coil or loop that is magnetically powered by a primary in a transformer or similar.
▸ noun:  One who occupies a subordinate or auxiliary place; a delegate deputy.
▸ noun:  (astronomy) A secondary circle.
▸ noun:  (astronomy) A satellite.
▸ noun:  (education) A secondary school.
▸ noun:  Anything secondary or of lesser importance.
▸ noun:  Short for secondary colour. [(British spelling) Any of three colours derived from mixing two primary colours]

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