Quaternary (disambiguation)
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Quaternary may refer to:
- Quaternary (or quartary), the fourth geologic time period
- The fourth Ordinal number (linguistics), coming after Tertiary
- Quaternary numeral system (base-4) in mathematics
- Quaternary counting system in linguistics
- Quaternary Communications Encoding, a method using 4 physical signal levels, such as 2B1Q encoding.
- Quaternary (EP), an extended play recording by Mötley Crüe
- Quaternary structure in structural biology
- Quaternary compound, in which an atom, usually carbon, is attached to four other atoms
- Quaternary sector of the economy, which encompasses knowledge-based services
- Quaternary stress, a proposed degree of stress in linguistics
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