13-Letter Words Containing: I,N,N,S

• a period of five years

• the relation that exists when things occur at the same time

• an adjustment that causes something to occur or recur in unison

• coordinating by causing to indicate the same time

• the act of dividing into quanta or expressing in terms of quantum theory

• tranquilizer used to treat psychotic disorders

• 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)

• tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults