synchrony
— Noun
– English
~ the relation that exists when things occur at the same time; "the drug produces an increased synchrony of the brain waves"
synchroscope
— Noun
– English
~ an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)
synchrotron
— Noun
– English
~ cyclotron in which the electric field is maintained at a constant frequency