Qua‐ter″na‐ry, n. [L. numerus quaternarius: cf. F. quaternaire.] 1. The number four. Boyle.
2. (Geol.) The Quaternary age, era, or formation. See the Chart of Geology.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.