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单词 quaternary
释义

WordReference Random House Unabridged Dictionary of American English © 2024
quat•er•nar•y  (kwotər ner′ē, kwə tûrnə rē),USA pronunciation adj., n., pl. -nar•ies. 
adj. 
  1. consisting of four.
  2. arranged in fours.
  3. Geology(cap.) noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era, originating about 2 million years ago and including the Recent and Pleistocene Epochs. See table under geologic time. 
  4. Metallurgy(of an alloy) having four principal constituents.

n. 
  1. a group of four.
  2. the number four.
  3. Geology(cap.) the Quaternary Period or System.
  • Latin quaternārius consisting of four, equivalent. to quatern(ī) four at a time + -ārius -ary
  • late Middle English 1400–50

Collins Concise English Dictionary © HarperCollins Publishers::
quaternary /kwəˈtɜːnərɪ/ adj
  1. consisting of fours or by fours
  2. fourth in a series
  3. containing or being an atom bound to four other atoms or groups
n ( pl -naries)
  1. the number four or a set of four
Etymology: 15th Century: from Latin quaternārius each containing four, from quaternī by fours, distributive of quattuor four
Collins Concise English Dictionary © HarperCollins Publishers::
Quaternary /kwəˈtɜːnərɪ/ adj
  1. of, denoting, or formed in the most recent period of geological time, which succeeded the Tertiary period nearly two million years ago
n
  1. the Quaternarythe Quaternary period or rock system, divided into Pleistocene and Holocene (Recent) epochs or series
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