資料來源 : Webster's Revised Unabridged Dictionary (1913)

Otto cycle \Ot"to cy`cle\ (Thermodynamics)
   A four-stroke cycle for internal-combustion engines
   consisting of the following operations: First stroke, suction
   into cylinder of explosive charge, as of gas and air; second
   stroke, compression, ignition, and explosion of this charge;
   third stroke (the working stroke), expansion of the gases;
   fourth stroke, expulsion of the products of combustion from
   the cylinder. This is the cycle invented by Beau de Rochas in
   1862 and applied by Dr. Otto in 1877 in the Otto-Crossley gas
   engine, the first commercially successful internal-combustion
   engine made.