• The Tertiary
  Tertiary
  The Tertiary is a deprecated term for a geologic period 65 million to 2.6 million years ago. The Tertiary covered the time span between the superseded Secondary period and the Quaternary...
  
   period of the geologic time scale.
• Tertiaries, members of a Third order (lay folk connected with a Mendicant Order).
• Ternary numeral system
  Ternary numeral system
  Ternary is the base- numeral system. Analogous to a bit, a ternary digit is a trit . One trit contains \log_2 3 bits of information...
  
  , the base- numeral system.
• A tertiary consumer in an ecological sense.
• A Tertiary functional group (or usually ion
  Ion
  An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge. The name was given by physicist Michael Faraday for the substances that allow a current to pass between electrodes in a...
  
  ) attached to carbon atom connected to three other carbon atoms in organic chemistry
• Tertiaries, the smallest group of remiges (wing feathers), which attach to the wings of birds. Usually, they are not flight feathers, but resemble body plumage.
• In economics the tertiary sector (of industry) is the service sector or the service industry (as opposed to the primary -agricultural and natural resources- and secondary, manufacturing)
• In biochemistry, the tertiary structure
  Tertiary structure
  In biochemistry and molecular biology, the tertiary structure of a protein or any other macromolecule is its three-dimensional structure, as defined by the atomic coordinates.-Relationship to primary structure:...
  
   of a protein is its overall shape, also known as its fold
• Tertiary or post-secondary education
• Tertiary care, specialized consultative healthcare.
• Ternary operation
  Ternary operation
  In mathematics, a ternary operation is an n-ary operation with n = 3. A ternary operation on a set A takes any given three elements of A and combines them to form a single element of A. An example of a ternary operation is the product in a heap....
  
  , in computer science a ternary operator (sometimes incorrectly referred to as a tertiary operator), an operator that takes three arguments

See also

• Primary
  Primary
  The word Primary when used alone may refer to any of the following:* Primary , the larger of two co-orbiting bodies* Primary is used for the name of the primary mirror in a telescope.* Primary , from Australia...
  
   (1st)
• Secondary
  Secondary
  Secondary is an adjective meaning "second" or "second hand". It may refer to:* The group of defensive backs in American football and Canadian football* An obsolete name for the Mesozoic in geosciences...
  
   (2nd)
• Binary
  Binary
  - Mathematics :* Binary numeral system, a representation for numbers using only two digits * Binary function, a function in mathematics that takes two arguments- Computing :* Binary file, composed of something other than human-readable text...
  
   (2)
• Ternary
  Ternary
  Ternary is an adjective meaning "composed of three items". It can refer to:* Ternary complex, a complex formed by the interaction of three molecules* Ternary compound, a type of chemical compound...
  
   (3)
• Quartary (4th)
• Quaternary (disambiguation)
  Quaternary (disambiguation)
  Quaternary may refer to:*Quaternary , the fourth geologic time period*Quaternary numeral system in mathematics**Quaternary counting system in linguistics*Quaternary , an extended play recording by Mötley Crüe...
  
   (4)
• Quintary (5th)
• Quinary
  Quinary
  Quinary is a numeral system with five as the base. A possible origination of a quinary system is that there are five fingers on either hand. The base five is stated from 0-4...
  
   (5)
• Sextary (6th)
• Senary
  Senary
  In mathematics, a senary numeral system is a base- numeral system.Senary may be considered useful in the study of prime numbers since all primes other than 2 and 3, when expressed in base-six, have 1 or 5 as the final digit...
  
   (6)
• Septenary
  Septenary
  The septenary numeral system is the base- number system, and uses the digits 0-6.-Multiplication table:-Fractions:Fractions expressed in septenary will repeat a sequence of digits unless the denominator is a power of seven...
  
   (7)
• Octonary
  Octal
  The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. Numerals can be made from binary numerals by grouping consecutive binary digits into groups of three...
  
   (8)
• Nonary
  Nonary
  Nonary is a base- numeral system, typically using the digits 0-8, but not the digit 9.The first few numbers in nonary and decimal are:Nonary 1 2 3 4 5 6 7 81011121314Decimal 1 2 3 4 5 6 7 8 910111213The...
  
   (9th)
• Denary (10)
• Duodenary
  Duodecimal
  The duodecimal system is a positional notation numeral system using twelve as its base. In this system, the number ten may be written as 'A', 'T' or 'X', and the number eleven as 'B' or 'E'...
  
   (12)
• Sedenary
  Hexadecimal
  In mathematics and computer science, hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F to represent values ten to fifteen...
  
   (16)
• Vigenary
  Vigesimal
  The vigesimal or base 20 numeral system is based on twenty .- Places :...
  
  (20)
• Centenary (100)