( a. )
Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
( a. )
Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012