Quaternary (disambiguation)

Quaternary (or quartary) is an adjective meaning "fourth in order" or "composed of four items". More specifically, it may refer to:

• Quaternary, the fourth geologic time period
  • Quaternary glaciation, the current ice age
• Quaternary numeral system (base-4) in mathematics
  • Quaternary Communications Encoding, a method using 4 physical signal levels, such as 2B1Q encoding.
  • Quaternary counting system, as used in some human languages
• Quaternary stress, a proposed degree of stress in linguistics
• Quaternary relation, in logic
• Quaternary structure in molecular biology
• Quaternary (chemistry)
  • Quaternary compound, in which an atom, usually carbon, is attached to four other atoms
  • Quaternary phase
• Quaternary sector of the economy, which encompasses knowledge-based services
• Quaternary care, health care that includes highly specialized or experimental treatments
• Quaternary prevention
• Quaternary (EP), an album by Mötley Crüe

Look up quaternary in Wiktionary, the free dictionary.