secondary vs under

secondary

adj
  • Of less than primary importance. 

  • Produced by alteration or deposition subsequent to the formation of the original rock mass. 

  • Derived from a parent compound by replacement of two atoms of hydrogen by organic radicals 

  • Developed by pressure or other causes. 

  • Dependent or consequent upon another disease, or occurring in the second stage of a disease. 

  • Related to secondary education, i.e. schooling between the ages of (approximately) 11 and 18. 

  • Originating from a deputy or delegated person or body 

  • Representing a reversion to an ancestral state. 

  • Formed by mixing primary colors. 

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

  • Pertaining to the second joint of the wing of a bird. 

  • Relating to the manufacture of goods from raw materials. 

noun
  • One who occupies a subordinate or auxiliary place; a delegate deputy. 

  • 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. 

  • The defensive backs. 

  • An inductive coil or loop that is magnetically powered by a primary in a transformer or similar. 

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

  • A satellite. 

  • An act of issuing more stock by an already publicly traded corporation. 

  • 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. 

  • A secondary circle. 

  • A secondary school. 

  • Anything secondary or of lesser importance. 

under

adj
  • Insufficient or lacking in a particular respect. 

  • Lower; beneath something. 

  • Under anesthesia, especially general anesthesia; sedated. 

  • In a state of subordination, submission or defeat. 

prep
  • Using or adopting (a name, identity, etc.). 

  • Subordinate to; subject to the control of; in accordance with; in compliance with. 

  • Within the category, classification or heading of. 

  • Below the surface of. 

  • Less than. 

  • In the face of; in response to (some attacking force). 

  • In or at a lower level than; in the area covered or surmounted by. 

  • From one side of to the other, passing beneath. 

noun
  • The amount by which an actual total is less than the expected or required amount. 

adv
  • Insufficiently. 

  • In or to a lower or subordinate position, or a position beneath or below something, physically or figuratively. 

  • In or into an unconscious state. 

  • So as to pass beneath something. 

How often have the words secondary and under occurred in a corpus of books? (source: Google Ngram Viewer )