trimestrial

As a noun trimester

is trimester, third part of an academic year.

As an adjective trimestrial is

of or pertaining to a trimester, or period of three months.

As adjectives the difference between quarterly and trimestrial

is that quarterly is occurring once every quarter year (three months) while trimestrial is of or pertaining to a trimester, or period of three months.

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 terms

is .

As an adjective trimestrial is

of or pertaining to a trimester, or period of three months.

As adjectives the difference between trimestrial and trimestral

is that trimestrial is of or pertaining to a trimester, or period of three months while trimestral is of trimesters or the use thereof.