One can use the terms primary, secondary, and tertiary to describe the first, second, and third levels of something.
What would the fourth level be called? Would it be something like "quartiary" or "quartenary"? How about the fifth level?
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1Just as a note: the duplicate english.stackexchange.com/questions/15550/… contains the answer to this question. The marked duplicate english.stackexchange.com/questions/25116/… contains the answer to this question as part of the question itself and not in the answers.– JimAug 15, 2014 at 19:04
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1 Answer
Fourth level: "quaternary"
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a : of, relating to, or consisting of four units or members
http://www.merriam-webster.com/dictionary/quaternary
Fifth level: "quinary"
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pertaining to or consisting of five.
http://dictionary.reference.com/browse/quinary
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In protein structure: "Globular and fibrous proteins may exhibit one or more of four types of protein structure. These structure types are called primary, secondary, tertiary, and quaternary structure."– DJohnMAug 15, 2014 at 20:30