quadrennial

As adjectives the difference between quarterly and quadrennial

is that quarterly is occurring once every quarter year (three months) while quadrennial is happening every four years.

As an adverb quarterly

is once every quarter year (three months).

As a noun quarterly

is a periodical publication that appears four times per year.

As a noun quadrennia

is plural of quadrennium.

As an adjective quadrennial is

happening every four years.

As adjectives the difference between quadrennial and quadriennial

is that quadrennial is happening every four years while quadriennial is .

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective quadrennial is

happening every four years.

As adjectives the difference between quadrennial and quadratic

is that quadrennial is happening every four years while quadratic is square-shaped.

As a noun quadratic is

a quadratic polynomial, function or equation.