quaternary

adj

1. (not-comparable)Of fourth rank or order.

   “the quaternary stress in a pronounced word”

2. (not-comparable)Of a mathematical expression containing e.g. x⁴.
3. (not-comparable)Relating to or in number base four.
4. (not-comparable)quaternary ammonium.
5. (not-comparable)Composed of four elements.

noun

1. A quaternary compound.
2. The Quaternary period or the system of deposits laid down during it.

name

1. The geological period of the Cenozoic Era immediately following the Tertiary. It is subdivided into the Pleistocene and the Holocene Epochs.

   “Meronyms: Pleistocene, Holocene, Anthropocene, assholocene”

2. (alt-of)Alternative letter-case form of quaternary.