quaternity

As an adjective quaternary

is of fourth rank or order.

As a proper noun Quaternary

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

As a noun quaternity is

a group or set of four.

As nouns the difference between terms and quaternity

is that terms is while quaternity is (countable) a group or set of four.

Quaternity is a related term of trinity.

As nouns the difference between trinity and quaternity

is that trinity is a group or set of three people or things; triad; trio; trine while quaternity is a group or set of four.

As a proper noun Trinity

is in Christian belief, the three persons (personae) of the Godhead: Father, Son and Holy Spirit.

As nouns the difference between fourness and quaternity

is that fourness is the property of being four in number while quaternity is a group or set of four.

In countable|lang=en terms the difference between four and quaternity

is that four is (countable) anything measuring four units, as length while quaternity is (countable) a group or set of four.

As nouns the difference between four and quaternity

is that four is (countable) the digit or figure 4; an occurrence thereof while quaternity is (countable) a group or set of four.

As a numeral four

is (cardinal) a numerical value equal to ; the number after three and before five; two plus two this many dots (••••).