A quarter is another way of saying one fourth, in this setting, one fourth of a year = three months.
Quarterly means something that happens every 3 months.
Quarterly is an adjective (quarterly bills) and an adverb (paid quarterly).
The Quarterly was created in 1987.
The Quarterly ended in 1995.
The plural form of quarterly is quarterlies.
Police Quarterly was created in 1998.
Crozer Quarterly was created in 1924.
Quarterly Essay was created in 2001.
Anthropological Quarterly was created in 1921.
Lapham's Quarterly was created in 2007.
Restoration Quarterly was created in 1957.
Linacre Quarterly was created in 1932.
The China Quarterly was created in 1960.