adverb
: per second every second — used of a rate of acceleration over an indefinite period
the value of the acceleration of gravity is … about 32 feet per second per second — N.H.Black & H.N.Davis
adverb
: per second every second — used of a rate of acceleration over an indefinite period
the value of the acceleration of gravity is … about 32 feet per second per second — N.H.Black & H.N.Davis
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012